The present invention is based on the discovery that the administration of at least one immunoconjugate and at least one chemotherapeutic agent provides an unexpectedly superior treatment for cancer. The present invention is directed to compositions comprising at least one immunoconjugate and at least one chemotherapeutic agent and to methods of treating cancer using at least one immunoconjugate and at least one chemotherapeutic agent. The present invention also provides methods of modulating the growth of selected cell populations, such as cancer cells, by administering a therapeutically effective amount of at least one chemotherapeutic agent and at least one immunoconjugate.
|
0. 17. An immunoconjugate comprising a cell binding agent and a maytansinoid, wherein the cell binding agent is conjugated to the maytansinoid using N-succinimidyl-4-[2-pyridyldithio]-pentanoate (SPP), and wherein the cell binding agent is a humanized n901 monoclonal antibody or an antigen binding fragment thereof.
0. 1. A pharmaceutical composition comprising a synergistic combination of at least one chemotherapeutic agent and at least one immunoconjugate; wherein the immunoconjugate comprises at least one maytansinoid compound linked to a monoclonal antibody or fragment thereof; wherein the monoclonal antibody or fragment thereof binds to an antigen expressed by a cancer cell, and wherein the chemotherapeutic agent is a taxane compound, an epothilone compound, a platinum compound, an epipodophyllotoxin compound, a camptothecin compound, or a mixture of two or more thereof.
0. 2. The pharmaceutical composition of
0. 3. The pharmaceutical composition of
0. 4. The pharmaceutical composition of
0. 5. The pharmaceutical composition of
0. 6. The pharmaceutical composition of
0. 7. The pharmaceutical composition of
0. 8. The pharmaceutical composition of
0. 9. The pharmaceutical composition of
##STR00008##
wherein is Z0 is H or SR; R is methyl, linear alkyl, branched alkyl, cyclic alkyl, simple or substituted aryl or heterocyclic; t is 1, 2 or 3; Y0 is chlorine or hydrogen; and X3 is hydrogen or methyl.
0. 10. The pharmaceutical composition of
0. 11. The pharmaceutical composition of
##STR00009##
wherein MAb is a monoclonal antibody or fragment thereof that binds to an antigen expressed by the cancer cell.
0. 12. A pharmaceutical composition comprising a synergistic combination of at least one chemotherapeutic agent and at least one immunoconjugate; wherein the chemotherapeutic agent is a taxane compound, an epothilone compound, a platinum compound, an epipodophyllotoxin compound, a camptothecin compound, or a mixture of two or more thereof; and wherein the immunoconjugate is:
##STR00010##
wherein MAb is a monoclonal antibody or fragment thereof that binds to an antigen expressed by a cancer cell.
0. 13. A pharmaceutical composition comprising a synergistic combination of (i) at least one chemotherapeutic agent selected from the group consisting of paclitaxel, docetaxel, cisplatin, etoposide, topotecan and irinotecan and (ii) an immunoconjugate comprising a maytansinoid and a humanized monoclonal antibody selected from the group consisting of n901 and C242.
0. 14. The pharmaceutical composition of
##STR00011##
wherein Z0 is H or SR; wherein R is methyl, linear alkyl, branched alkyl, cyclic alkyl, simple or substituted aryl or heterocyclic; t is 1, 2 or 3; Y0 is chlorine or hydrogen; and X3 is hydrogen or methyl.
0. 15. A pharmaceutical composition comprising a synergistic combination of (i) at least one chemotherapeutic agent selected from the group consisting of paclitaxel, docetaxel, cisplatin, etoposide, topotecan and irinotecan and (ii) an immunoconjugate comprising a maytansinoid and a humanized monoclonal antibody or fragment thereof that binds to an antigen expressed by a small cell lung cancer cell, a non small cell lung cancer cell or a colorectal cancer cell.
0. 16. The pharmaceutical composition of
##STR00012##
wherein Z0 is H or SR; wherein R is methyl, linear alkyl, branched alkyl, cyclic alkyl, simple or substituted aryl or heterocyclic; t is 1, 2 or 3; Y0 is chlorine or hydrogen; and X3 is hydrogen or methyl.
0. 18. The immunoconjugate of claim 17, wherein the cell binding agent is a humanized n901 monoclonal antibody.
0. 19. The immunoconjugate of claim 17, wherein the cell binding agent is an Fv, Fab, Fab′, or F(ab′)2 fragment of a humanized n901 monoclonal antibody.
0. 20. The immunoconjugate of claim 17, wherein the maytansinoid is DM1.
0. 21. A pharmaceutical composition comprising the immunoconjugate of claim 17 and a pharmaceutically acceptable carrier.
|
|||||||||||||||||||||||||||||||||||||||||||||
Notice: More than one reissue application has been filed for the reissue of U.S. Pat. No. 7,303,749, filed Sep. 29, 2000. The present application is a continuation reissue application of U.S. patent application Ser. No. 12/631,508, now abandoned.
This application is a reissue continuation of application Ser. No. 12/631,508, filed Dec. 4, 2009, abandoned, which is a Reissue Application of U.S. application Ser. No. 09/671,995, filed Sep. 29, 2000 (U.S. Pat. No. 7,303,749, issued Dec. 4, 2007), which claims priority to U.S. Provisional Application No. 60/157,051, filed Oct. 1, 1999. The entire disclosures of the aforementioned related applications and patents are hereby incorporated by reference in their entirety.
The present invention is based on the discovery that the administration of at least one immunoconjugate and at least one chemotherapeutic agent provides an unexpectedly superior treatment for cancer. The present invention is directed to compositions comprising at least one immunoconjugate and at least one chemotherapeutic agent and to methods of treating cancer using a therapeutically effective amount of at least one immunoconjugate and at least one chemotherapeutic agent. The present invention is also directed to methods of modulating the growth of selected cell populations using a therapeutically effective amount of at least one chemotherapeutic agent and at least one immunoconjugate.
Of all lung cancer cases diagnosed in the United States every year, 20-25% are small cell lung cancer (SCLC). Current treatments for small cell lung cancer include surgery, radiation treatment, and chemotherapeutic agents, such as paclitaxel or a combination of etoposide and cisplatin. Despite these treatment options, there is only a 1-5% survival rate after 5 years in patients who have clinically evident metastatic disease upon diagnosis. Glisson et al, Journal of Clinical Oncology, 17(8):2309-2315 (August 1999).
Pre-clinical studies reveal that small cell lung cancers can also be treated with an immunoconjugate comprising a monoclonal antibody and a maytansinoid. Liu et al, Proceedings of the American Association for Cancer Research, 38:29 (abstract 190) (1997). In this study, the maytansinoid was DM1, and the monoclonal antibody was humanized N901. Humanized monoclonal antibody N901 targets CD56, which is expressed on substantially all small cell lung cancers.
There is a need in the art for new and more effective methods for treating cancer. The present invention is directed to these, as well as other, important ends.
The present invention is based on the discovery that the use of at least one chemotherapeutic agent and at least one immunoconjugate produces unexpectedly superior results in the treatment of cancer.
The present invention describes methods of treating cancer in a patient in need thereof by administering to the patient a therapeutically effective amount of at least one chemotherapeutic agent and at least one immunoconjugate. The chemotherapeutic agent can be any known in the art including, for example, taxane compounds, compounds that act via taxane mechanisms, platinum compounds, epipodophyllotoxin compounds, camptothecin compounds, or any combination thereof. The immunoconjugate can comprise a cell binding agent and at least one therapeutic agent for killing selected cell populations. The cell binding agent is preferably a monoclonal antibody or a fragment thereof, and the therapeutic agent for killing selected cell populations is preferably an anti-mitotic agent, such as a maytansinoid, a Vinca alkaloid, a dolastatin, or a cryptophycin. In particularly preferred embodiments, the immunoconjugate comprises the maytansinoid DM1 and humanized N901 monoclonal antibody. The chemotherapeutic agent and immunoconjugate can be administered separately or as components of the same composition.
The present invention also describes methods of modulating the growth of selected cell populations, such as cancer cells, by administering a therapeutically effective amount of at least one chemotherapeutic agent and at least one immunoconjugate. The chemotherapeutic agent can be any known in the art including, for example, taxane compounds, compounds that act via taxane mechanisms, platinum compounds, epipodophyllotoxin compounds, camptothecin compounds, or any combination thereof. The immunoconjugate can comprise a cell binding agent and at least one therapeutic agent for killing selected cell populations. The cell binding agent is preferably a monoclonal antibody or a fragment thereof, and the therapeutic agent for killing selected cell populations is preferably an anti-mitotic agent, such as a maytansinoid, a Vinca alkaloid, a dolastatin, or a cryptophycin. In particularly preferred embodiments, the immunoconjugate comprises the maytansinoid DM1 and humanized N901 monoclonal antibody. The chemotherapeutic agent and immunoconjugate can be administered separately or as components of the same composition.
The present invention also describes compositions comprising at least one chemotherapeutic agent and at least one immunoconjugate. The chemotherapeutic agent can be any known in the art including, for example, taxane compounds, compounds that act via taxane mechanisms, platinum compounds, epipodophyllotoxin compounds, camptothecin compounds, or any combination thereof. The immunoconjugate can comprise a cell binding agent and at least one therapeutic agent for killing selected cell populations. The cell binding agent is preferably a monoclonal antibody or a fragment thereof, and the therapeutic agent for killing selected cell populations is preferably an anti-mitotic agent, such as a maytansinoid, a Vinca alkaloid, a dolastatin, or a cryptophycin. In particularly preferred embodiments, the immunoconjugate comprises the maytansinoid DM1 and humanized N901 monoclonal antibody. The composition can comprise a pharmaceutically acceptable carrier, excipient or diluent.
These and other aspects of the present invention are described in detail herein.
The present invention is based on the unexpected discovery that the administration of at least one chemotherapeutic agent and at least one immunoconjugate produces superior results in the treatment of cancer. Appropriate chemotherapeutic agents and immunoconjugates are described herein.
The immunoconjugates of the present invention comprise at least one therapeutic agent for killing selected cell populations linked to a cell binding agent. The therapeutic agent for killing selected cell populations is preferably an anti-mitotic agent. Anti-mitotic agents, which are known in the art, kill cells by inhibiting tubulin polymerization and, therefore, microtubule formation. Any anti-mitotic agent known in the art can be used in the present invention, including, for example, maytansinoids, Vinca alkaloids, dolastatins, cryptophycins, and/or any other agent that kills cells by inhibiting tubulin polymerization. Preferably, the anti-mitotic agent is a maytansinoid.
Maytansinoids that can be used in the present invention, to produce the modified maytansinoid capable of being linked to a cell binding agent, are well known in the art and can be isolated from natural sources according to known methods or prepared synthetically according to known methods. Preferred maytansinoids are those described, for example, in U.S. Pat. No. 5,208,020, the disclosure of which is incorporated by reference herein in its entirety.
Suitable maytansinoids include maytansinol and maytansinol analogues. Examples of suitable maytansinol analogues include those having a modified aromatic ring and those having modifications at other positions. Specific examples of suitable analogues of maytansinol having a modified aromatic ring include: C-19-dechloro (U.S. Pat. No. 4,256,746) (prepared by LAH reduction of ansamitocin P-2); C-20-hydroxy (or C-20-demethyl)+/−C-19-dechloro (U.S. Pat. Nos. 4,361,650 and 4,307,016) (prepared by demethylation using Streptomyces or Actinomyces or dechlorination using LAH); and C-20-demethoxy, C-20-acyloxy (—OCOR), +/−dechloro (U.S. Pat. No. 4,294,757) (prepared by acylation using acyl chlorides).
Specific examples of suitable analogues of maytansinol having modifications of other positions include: C-9-SH (U.S. Pat. No. 4,424,219) (prepared by the reaction of maytansinol with H2S or P2S5); C-14-alkoxymethyl(demethoxy/CH2OR) (U.S. Pat. No. 4,331,598); C-14-hydroxymethyl or acyloxymethyl (CH2OH or CH2OAc) (U.S. Pat. No. 4,450,254) (prepared from Nocardia); C-15-hydroxy/acyloxy (U.S. Pat. No. 4,364,866) (prepared by the conversion of maytansinol by Streptomyces); C-15-methoxy (U.S. Pat. Nos. 4,313,946 and 4,315,929) (isolated from Trewia nudlflora); C-18-N-demethyl (U.S. Pat. Nos. 4,362,663 and 4,322,348) (prepared by the demethylation of maytansinol by Streptomyces); and 4,5-deoxy (U.S. Pat. No. 4,371,533) (prepared by the titanium trichloride/LAH reduction of maytansinol).
In order to link the maytansinoid to the cell binding agent, the maytansinoid must be modified, and a linking group can be used. Suitable linking groups are known in the art and include, for example, disulfide groups, thioether groups, acid labile groups, photolabile groups, peptidase labile groups and esterase labile groups. Preferred are disulfide groups and thioether groups.
The linking group is part of a chemical moiety that is covalently bound to the maytansinoid through conventional methods. In a preferred embodiment, the chemical moiety can be covalently bound to the maytansinoid via an ester linkage.
Many positions on maytansinoids are useful as the linkage position, depending upon the type of link. For example, for forming an ester linkage, the C-3 position having a hydroxyl group, the C-14 position modified with hydroxymethyl, the C-15 position modified with hydroxy, and the C-20 position having a hydroxy group are all expected to be useful. The C-3 position is preferred and the C-3 position of maytansinol is especially preferred. Also preferred is an N-methyl-alanine-containing C-3 ester and an N-methyl-cysteine-containing C-3 ester of maytansinol or its analogues.
The synthesis of esters of maytansinol having a linking group is described in U.S. Pat. No. 5,208,020. While the synthesis of esters of maytansinol having a linking group is described herein in terms of thiol and disulfide linking groups, one of skill in the art will understand that other linking groups can also be used with the invention, as can other maytansinoids.
The synthesis of maytansinoid derivatives can be described by reference to
ω-Mercapto-carboxylic acids of varying chain lengths are converted into their respective methyl-dithio, e.g., 3a-3d (where n=1-10, including branched and cyclic aliphatics), or aryl-dithio, e.g., 4a-4b, derivatives by reacting them with methyl methanethiolsulfonate or aryldisulfides, such as diphenyldisulfide and ring substituted diphenyldisulfides and heterocyclic disulfides such as 2,2-dithiopyridine. The carboxylic acids are activated and then reacted with N-methyl-L-alanine to form the desired carboxylic acid compounds, e.g., 5a-5f, for condensation with maytansinol 1b.
Esterification of maytansinol 1b or an analogue with the carboxylic acids 5a-5f gives the disulfide-containing maytansinoids 6a-6f. Cleavage of the disulfide group in 6a-6f with dithiothreitol gives the thiol-containing maytansinoids 7a-7c, which are readily linked via disulfide or thioether links to cell binding agents. N-methyl-L-alanine can be prepared as described in the literature (Fu et al, J. Amer. Chem. Soc., 75:1953); or is obtainable commercially (Sigma Chemical Company).
In another embodiment, N-methyl-cysteine or N-methylhomocysteine can be converted to the respective disulfide derivatives 8 (n=1 and 2, respectively) which are then acylated to yield the desired carboxylic acids 9 (n=1 and 2, respectively). Maytansinol is then esterified with 9 (n=1) to give disulfide-containing ester 10. Reduction of 10a with dithiothreitol as described for 7b produces the thiol-containing maytansinoid 11 which can be conjugated to cell binding agents. N-methyl-cysteine can be prepared as described in Undheim et al, Acta Chem. Scand., 23:3129-3133 (1970).
More specifically, maytansinol 1b is derived from maytansine 1a or other esters of maytansinol by reduction such as with lithium aluminum hydride. (Kupchan et al, J. Med. Chem., 21:31-37 (1978); U.S. Pat. No. 4,360,462). It is also possible to isolate maytansinol from the microorganism Nocardia (U.S. Pat. No. 4,151,042). Maytansinol is then converted to the different ester derivatives, 6a to 6f and 10, using a suitable agent such as dicyclohexylcarbodiimide (DCC) and catalytic amounts of zinc chloride (U.S. Pat. Nos. 4,137,230 and 4,260,609; Kawai et al, Chem. Pharm. Bull., 32:3441-3951 (1984)). The two diastereomeric products containing the D and L-aminoacyl side chains result. The diastereomeric maytansinoid esters are readily separated by preparative TLC on silica gel. For example, using Analtech GF plates (1000 microns) and developing with 6% methanol in chloroform yields distinct banding: the desired bands are scraped off the plate and the products extracted with ethyl acetate (Kupchan, J. Med. Chem., 21:31-37 (1978) and U.S. Pat. No. 4,360,462).
Reduction of the disulfide-containing maytansinoids to the corresponding mercapto-maytansinoids 7a, 7b, 7c and 11, is achieved by treatment with dithiothreitol (DTT) and purification by HPLC using a Waters radialpak C-18 column and eluting with a linear gradient of 55% to 80% acetonitrile in H2O over 10 minutes at a flow rate of 1.5 ml/min.
When analogues of maytansinol are used as the starting material to give analogous disulfide-containing maytansinoid esters, the analogues are prepared before reacting them with the N-methyl-L-alanine or N-methyl-L-cysteine derivatives.
One example of N-methyl-alanine-containing maytansinoid derivatives useful in the present invention is represented by formula (I):
##STR00001##
wherein
Z0 represents H or SR, wherein R represents methyl, linear alkyl, branched alkyl, cyclic alkyl, simple or substituted aryl or heterocyclic;
p represents an integer of 1 to 10; and
“may” represents a maytansinoid.
In a preferred embodiment of the compound of formula (I), Z0 represents SR, R represents methyl, and p represents an integer of 2.
Another example of N-methyl-alanine-containing maytansinoid derivatives useful in the present invention is represented by formula (II):
##STR00002##
wherein
R1 and R2, which may be the same or different, represents H, CH3 or CH2CH3;
Z1 represents H or SR3, wherein R3 represents methyl, linear alkyl, branched alkyl, cyclic alkyl, simple or substituted aryl, or heterocyclic:
m represents 0, 1, 2 or 3; and
“may” represents a maytansinoid.
Another example of N-methyl-alanine-containing maytansinoid derivatives useful in the present invention is represented by formula (III):
##STR00003##
wherein:
Z2 represents H or SR4, wherein R4 represents methyl, linear alkyl, branched alkyl cyclic alkyl, simple or substituted aryl, or heterocyclic;
n represents an integer of 3 to 8; and
“may” represents a maytansinoid.
Yet another example of N-methyl-alanine-containing maytansinoid derivatives useful in the present invention is represented by formula (IV):
##STR00004##
wherein:
Z0 represents H or SR, wherein R represents methyl, linear alkyl, branched alkyl, cyclic alkyl, simple or substituted aryl or heterocyclic:
t represents 1, 2 or 3;
Y0 represents Cl or H; and
X3 represents H or CH3.
A specific example of N-methyl-cysteine-containing maytansinoid derivatives useful in the present invention is represented by formula (V):
##STR00005##
wherein:
Z3 represents H or SR5, wherein R5 represents methyl, linear alkyl, branched alkyl, cyclic alkyl, simple or substituted aryl, or heterocyclic;
o represents 1, 2 or 3;
p represents 0 or an integer of 1 to 10; and
“may” represents a maytansinoid.
Another specific example of N-methyl-cysteine-containing maytansinoid derivatives useful in the present invention is represented by formula (VI):
##STR00006##
wherein:
Z3 represents H or SR5, wherein R5 represents methyl, linear alkyl, branched alkyl, cyclic alkyl, simple or substituted aryl or heterocyclic;
o represents 1, 2, or 3;
q represents 0 or an integer of 1 to 10;
Y0 represents Cl or H; and
X3 represents H or CH3.
Examples of linear alkyls include methyl, ethyl, propyl, butyl, pentyl, and hexyl. Examples of branched alkyls include isopropyl, isobutyl, sec-butyl, tert-butyl, isopentyl, and 1-ethyl-propyl. Examples of cyclic alkyls include cyclopropyl, cyclobutyl, cyclopentyl, and cyclohexyl. Examples of simple aryls include phenyl, and naphthyl. Examples of substituted aryls include aryls such as those described above substituted with alkyl groups, with halogens, such as Cl, Br, F, nitro groups, amino groups, sulfonic acid groups, carboxylic acid groups, hydroxy groups, and alkoxy groups. Examples of heterocyclics are compounds wherein the heteroatoms are selected from O, N and S, and include pyrrollyl, pyridyl, furyl, and thiophene.
Vinca alkaloids that can be used in the present invention, to produce the modified Vinca alkaloids capable of being linked to a cell binding agent, are well known in the art. Such Vinca alkaloids include, for example, those described in Cancer Principles and Practice in Oncology, 4th Ed., DeVita et al, eds., J. B. Lippincott Company, Philadelphia Pa. (1993) and by Morris et al, J. Clin. Oncol., 16:1094-1098 (1998), the disclosures of which are incorporated herein by reference in their entirety. Exemplary Vinca alkaloids include vincristine, vinblastine, vindesine, navelbine (vinorelbine), and the like. Other Vinca alkaloids that can be used in the present invention include those described, for example, in U.S. Pat. Nos. 5,369,111, 4,952,408, 5,395,610, 4,522,750, 5,888,537, 5,891,724, 5,795,589, 4,172,077, 5,714,163, 5,436,243, 3,932,417, 5,869,620, 5,795,575, 5,780,446, 5,676,978, 5,604,237, 5,171,217, 4,831,038, 4,828,831, 4,765,972, 4,375,432, 4,309,415, 5,939,455, 5,874,402, 5,767,260, 5,763,733, 5,728,687, 5,716,928, 5,660,827, 5,541,232, 5,346,897, 5,220,016, 5,208,238, 5,190,949, 4,479,957, 4,160,767, 4,159,269, 4,096,148, RE 30,561, RE 30,560, U.S. Pat. Nos. 5,935,955, 5,922,340, 5,886,025, 5,866,679, 5,863,538, 5,855,866, 5,817,321, 5,783,178, 5,776,427, 5,767,110, 5,753,507, 5,723,625, 5,698,178, 5,686,578, 5,667,764, 5,654,287, 5,646,124, 5,635,515, 5,635,218, 5,606,017, 5,597,830, 5,595,756, 5,583,052, 5,561,136, 5,547,667, 5,543,152, 5,529,076, 5,491,285, 5,482,858, 5,455,161, 5,430,026, 5,403,574, 5,399,363, 5,397,784, 5,387,578, 5,364,843, 5,300,282, 5,182,368, 5,162,115, 5,147,294, 5,108,987, 5,100,881, 5,047,528, 5,030,620, 5,004,593, 4,946,833, 4,931,468, 4,923,876, 4,801,688, 4,737,586, 4,667,030, 4,617,305, 4,578,351, 4,476,026, 4,399,069, 4,279,817, 4,208,414, 4,199,504, 4,070,358, 4,029,663, 3,965,254, 3,954,773, 3,944,554, 3,887,565, 6,120,800, 6,071,947, 6,071,930, 6,069,146, 6,063,911, 5,994,367, 5,962,216, and 5,945,315, the disclosures of which are incorporated by reference herein in their entirety.
The Vinca alkaloids can be linked to cell binding agents, such as antibodies, via acid-labile hydrazide links by methods described by, for example, Laguzza et al, J. Med. Chem., 32:548-555 (1989), Schrappe et al, Cancer Res., 52:3838-3844 (1992), and Apelgren et al, Cancer Res., 50:3540-3544 (1990), the disclosures of which are incorporated by reference herein in their entirety. A preferable method is to link the Vinca alkaloids to a cell binding agent via disulfide bonds. The carboxy ester at the C-3 position of vinblastine, vincristine and navelbine can be hydrolzyed to the corresponding carboxylic acid using standard chemical methods. In vindesine, the carboxamide group at C-3 can be hydrolyzed to the free carboxy group. The free carboxy group in each of the Vinca alkaloids can be converted to an amide compound containing a terminal disulfide group by reaction with a protected cysteamine (e.g., methydithiocysteamine) in the presence of a coupling agent such as dicyclohexyl-carbodidimide (DCC) or ethyl dimethylamin-propylcarbodiimide (EDC). The resulting disulfide containing Vinca alkaloid is reduced with a reducing agent, such as dithiothreitol, to provide a thiol-containing compound. The thiol-containing Vinca alkaloid can be coupled to a cell-binding agent via disulfide exchange as described herein for the preparation of antibody-maytansinoid conjugates.
Dolastatins that can be used in the present invention, to produce the modified dolastatins capable of being linked to a cell binding agent, are well known in the art. Such dolastatins include, for example, those described by Pitot et al, Clin. Cancer Res., 5:525-531 (1999) and Villalona-Calero et al, J. Clin. Oncol., 16:2770-2779 (1998), the disclosures of which are incorporated by reference herein in their entirety. Exemplary dolastatins include dolastatin 10, dolastatin 15, and the like. Other dolastatins that can be used in the present invention include those described, for example, in U.S. Pat. Nos. 5,945,543, 5,939,527, 5,886,147, 5,886,025, 5,883,120, 5,856,324, 5,840,699, 5,831,002, 5,821,222, 5,807,984, 5,780,588, 5,767,237, 5,750,713, 5,741,892, 5,665,860, 5,663,149, 5,654,399, 5,635,483, 5,626,864, 5,599,902, 5,554,725, 5,530,097, 5,521,284, 5,504,191, 5,502,032, 5,410,024, 5,410,024, 5,378,803, 5,352,804, 5,138,036, 5,091,368, 5,076,973, 4,986,988, 4,978,744, 4,879,278, 4,816,444, 4,486,414, 4,414,205, 6,103,913, 6,103,698, 6,096,757, 6,034,065, 6,020,495, 6,017,890, 6,004,934, 5,985,837, 5,965,700, and 5,965,537, the disclosures of which are incorporated by reference herein in their entirety.
The synthetic scheme described for dolastatin 10 by Pettit et al, J. Am. Chem. Soc., 111:5463-5465 (1989), the disclosure of which is incorporated by reference herein in its entirety, can be followed, with minor modification, to provide a thiol-containing dolastatin that can be linked via disulfide bonds to a cell binding agent, such as an antibody. The phenylalanine moiety in the dolphenine residue in the C-terminal of dolastatin 10 is replaced by a methyldithio-substituent containing amino acid. Thus, tyrosine can be converted into an ether by reaction with a commercially available dibromoalkane, such as 1,3-dibromobutane, using standard chemical methods. The resulting bromo compound is reacted with potassium thioacetate, followed by hydrolysis, to give a thiol-containing tyrosine. Conversion is achieved as described by Pettit, supra. The thiol-containing dolastatin can be coupled to a cell binding agent via disulfide exchange as described herein for the preparation of an antibody-maytansinoid conjugate.
Cryptophycins that can be used in the present invention, to produce the modified cryptophycins capable of being linked to a cell binding agent, are well known in the art. Such cryptophycins include, for example, those described by Smith et al, Cancer Res., 54:3779-3783 (1994), Panda et al, Proc. Natl. Acad. Sci., 95:9313-9318 (1998), and Bai et al, Cancer Res., 56:4398-4406 (1996), the disclosures of which are incorporated by reference herein in their entirety. Exemplary cryptophycins include cryptophycin 52, cryptophycin 1, and the like. Other cryptophycins that can be used in the present invention include those described, for example, in Great Britain Patent No. 2220657; European Patent Nos. 870506, 870501, 861838, 861839, 792875 and 870510; U.S. Pat. Nos. 6,103,913, 6,046,177, 6,020,512, 6,013,626, 5,977,387, 5,955,423, 5,952,298, 5,945,315, 5,886,025, and 5,833,994; and WIPO Publication Nos. 98/38178, 98/38164, 98/08829, 98/08506, 98/08505, 97/31632, 97/08334, 97/07798, 98/09601, 97/23211, 98/46581, 98/38158, 98/09988, 98/09974, 98/08812, and 98/09955, the disclosures of which are incorporated herein by reference in their entirety.
The aromatic methoxy group in the cryptophycins can be hydrolyzed by standard chemical or enzymatic methods to give the phenolic derivative. The phenol group can be converted into an ether by reaction with a commercially available dibromoalkane, such as 1,3-dibromobutane, using standard chemical methods. The resulting bromo compound is reacted with potassium thioacetate, followed by hydrolysis, to give a thiol-containing cryptophycin. The thiol-containing cryptophycin can be coupled to a cell binding agent via disulfide exchange as described herein for the preparation of antibody-maytansinoid conjugates.
Disulfide-containing and mercapto-containing maytansinoid (or Vinca alkaloid or dolastatin or cryptophycin) drugs of the invention can be evaluated for their ability to suppress proliferation of various unwanted cell lines using in vitro methods generally accepted in the art as being predictive of in vivo activity. For example, cell lines such as the human epidermoid carcinoma line KB, the human breast tumor line SKBR3 and the Burkitt's lymphoma line Namalwa can easily be used for the assessment of cytotoxicity of these compounds. Cells to be evaluated can be exposed to the compounds for 24 hours and the surviving fractions of cells measured in direct assays by known methods. IC50 values can then be calculated from the results of the assays.
The effectiveness of the immunoconjugates as therapeutic agents depends on the careful selection of an appropriate cell binding agent. Cell binding agents may be of any kind presently known, or that become known, and include peptides and non-peptides. Generally, these can be antibodies (especially monoclonal antibodies), lymphokines, hormones, growth factors, nutrient-transport molecules (such as transferrin), or any other cell binding molecule or substance.
More specific examples of cell binding agents that can be used include: monoclonal antibodies; fragments of antibodies such as Fv, Fab, Fab′, and F(ab′)2 (Parham, J. Immunol., 131:2895-2902 (1983); Spring et al, J. Immunol., 113:470-478 (1974); Nisonoff et al, Arch. Biochem. Biophys., 89:230-244 (1960)); interferons (e.g., α, β, γ); lymphokines such as IL2, IL3, IL-4, IL-6; hormones such as insulin, TRH (thyrotropin releasing hormone), MSH (melanocyte-stimulating hormone), steroid hormones such as androgens and estrogens; growth factors and colony-stimulating factors such as EGF, TGF-α, G-CSF, M-CSF and GM-CSF (Burgess, Immunology Today, 5:155-158 (1984)); and transferrin (O'Keefe et al, J. Biol. Chem., 260:932-937 (1985)).
Monoclonal antibody techniques allow for the production of extremely specific cell binding agents in the form of specific monoclonal antibodies. Particularly well known in the art are techniques for creating monoclonal antibodies produced by immunizing mice, rats, hamsters or any other mammal with the antigen of interest such as the intact target cell, antigens isolated from the target cell, whole virus, attenuated whole virus, and viral proteins such as viral coat proteins. Sensitized human cells can also be used.
Selection of the appropriate cell binding agent is a matter of choice that depends upon the particular cell population that is to be targeted, but in general monoclonal antibodies are preferred if an appropriate one is available.
For example, the monoclonal antibody J5 is a murine IgG2a antibody that is specific for the Common Acute Lymphoblastic Leukemia Antigen (CALLA) (Ritz et al, Nature, 283:583-585 (1980)) and can be used if the target cells express CALLA such as in the disease of acute lymphoblastic leukemia. Similarly, the monoclonal antibody anti-B4 is a murine IgG1, that binds to the CD19 antigen on B cells (Nadler et al, J. Immunol., 131:244-250 (1983)) and can be used if the target cells are B cells or diseased cells that express this antigen such as in non-Hodgkin's lymphoma or chronic lymphoblastic leukemia.
Additionally, GM-CSF which binds to myeloid cells can be used as a cell binding agent to diseased cells from acute myelogenous leukemia. IL-2 which binds to activated T-cells can be used for prevention of transplant graft rejection, for therapy and prevention of graft-versus-host disease, and for treatment of acute T-cell leukemia. MSH which binds to melanocytes can be used for the treatment of melanoma.
Cancers of the breast and testes can be successfully targeted with estrogen (or estrogen analogues) or androgen (or androgen analogues), respectively, as cell binding agents.
In a preferred embodiment, the antibody or fragment thereof is one that is specific for lung cancer, preferably small cell lung cancer. An antibody or fragment thereof that is specific for small cell lung cancer can be determined by methods described in the art, such as by Doria et al, Cancer 62:1939-1945 (1988). Preferably, the antibody or fragment thereof binds to an epitope on the CD56 antigen, which is expressed on substantially all small cell lung cancers. For example, N901 is an IgG1 murine monoclonal antibody (also called anti-N901) that is reactive with CD56, which is expressed on tumors of neuroendocrine origin, such as small cell lung cancer. See Griffin et al, J. Immunol. 130:2947-2951 (1983), and Roguska et al, Proc. Natl. Acad. Sci. USA, 91:969-973 (1994), the disclosure of which are incorporated by reference herein in their entirety.
Preferred antibodies or fragments thereof that are specific for small cell lung cancers include, but are not limited to, N901, NKH-1, Leu-7, anti-Leu-7, and the like (Doria et al, Cancer 62:1939-1945 (1988); Kibbelaar et al, Journal of Pathology, 159:23-28 (1989)). Other suitable antibodies or fragments thereof for use in the present invention include, for example, S-L 3-5, S-L 4-20, S-L 7-3, S-L11-14, TFS-4, MOC-1, MOC-21, MOC-31, MOC-32, MOC-52, 123A8, 123C3, UJ13A, B10/B12, SWA4, SWA20, SWA21, SWA22, SWA23, LAM-8, 534F8, 703D4704A1 and SM1, which are further described in Table I of Chapter 3 of the Proceedings of the First International Workshop on Small Cell Lung Cancer Antigens (London 1987), published in Lung Cancer, 4:15-36 (1988), the disclosures of which are incorporated by reference herein in their entirety. In a most preferred embodiment, the antibody is N901, or a fragment thereof, that binds to an epitope on the CD56 antigen, such as Fv, Fab, Fab′ and F(ab′)2. The monoclonal antibody or fragment thereof can be any other antibody that binds to the CD56 antigen with the same specificity as N901. “Same specificity” means that the antibody or fragment thereof can bind to the same antigen as demonstrated by a competitive binding assay with N901.
Another preferred antibody or fragment thereof that is useful in the present invention is C242 (commercially available from CanAg Diagnostics AB, Sweden). C242 is also described in U.S. Pat. No. 5,552,293, the disclosure of which is incorporated by reference herein in its entirety.
In other preferred embodiments, the antibodies described herein are humanized antibodies or fragments thereof because humanized antibodies or fragments thereof are not expected to elicit an immune response in humans. Generally, antibodies can be humanized through the application of different humanization technologies described, for example, in U.S. Pat. Nos. 5,225,539, 5,585,089, and 5,639,641, the disclosures of which are incorporated by reference herein in their entirety. The preparation of different versions of humanized N901, is described, for example, by Roguska et al Proc. Natl. Acad. Sci. USA, 91:969-973 (1994), and Roguska et al, Protein Eng., 9:895:904 (1996), the disclosures of which are incorporated by reference herein in their entirety. To denote a humanized antibody, the letters “hu” or “h” appear before the name of the antibody. For example, humanized N901 is also referred to as huN901 or hN901.
Conjugates of the maytansinoid derivatives of the invention and a cell binding agent can be formed using any techniques presently known or later developed. The maytansinoid ester can be modified to yield a free amino group and then linked to an antibody or other cell binding agent via an acid-labile linker, or a photolabile linker. The maytansinoid ester can be condensed with a peptide and subsequently linked to a cell binding agent to produce a peptidase-labile linker. The maytansinoid ester can be treated to yield a primary hydroxyl group, which can be succinylated and linked to a cell binding agent to produce a conjugate that can be cleaved by intracellular esterases to liberate free drug. Most preferably, the maytansinoid esters are treated to create a free or protected thiol group, and then one or many disulfide or thiol-containing maytansinoid derivatives are covalently linked to the cell binding agent via disulfide bond(s).
Representational conjugates of the invention are antibody/maytansinoid derivatives, antibody fragment/maytansinoid derivatives, epidermal growth factor (EGF)/maytansinoid derivatives, melanocyte stimulating hormone (MSH)/maytansinoid derivatives, thyroid stimulating hormone (TSH)/maytansinoid derivatives, estrogen/maytansinoid derivatives, estrogen analogue/maytansinoid derivatives, androgen/maytansinoid derivatives, androgen analogue/maytansinoid derivatives.
Maytansinoid conjugates of antibodies, antibody fragments, protein hormones, protein growth factors and other proteins are made in the same way. For example, peptides and antibodies can be modified with crosslinking reagents such as N-succinimidyl 3-(2-pyridyldithio)propionate, N-succinimidyl 4-(2-pyridyldithio)-pentanoate (SPP), 4-succinimidyl-oxycarbonyl-α-methyl-α-(2-pyridyldithio)toluene (SMPT), N-succinimidyl-3-(2-pyridyldithio)-butyrate (SDPB), 2-iminothiolane, or acetylsuccinic anhydride by known methods (U.S. Pat. No. 4,563,304; Carlsson et al, Biochem. J., 173:723-737 (1978); Blättler et al, Biochem., 24:1517-1524 (1985); Lambert et al, Biochem., 22:3913-3920 (1983); Klotz et al, Arch. Biochem. Biophys., 96:605 (1962); and Liu et al, Biochem., 18:690 (1979), Blakey and Thorpe, Antibody, Immunoconjugates and Radiopharmaceuticals, 1:1-16 (1988); Worrell et al, Anti-Cancer Drug Design, 1:179-184 (1986), the disclosures of which are incorporated by reference herein in their entirety). The cell binding agent containing free or protected thiol groups thus-derived is then reacted with a disulfide- or thiol-containing maytansinoid to produce conjugates. The conjugates can be purified by HPLC or by gel filtration.
Similarly, for example, estrogen and androgen cell binding agents, such as estradiol and androstenediol, can be esterified at the C-17 hydroxy group with an appropriate disulfide-containing carboxylic acid, e.g., dicyclohexylcarbodiimide, as a condensing agent. Examples of such carboxylic acids that can be used are 3-(2-pyridyldithio)propanoic acid, 3-methyldithiopropanoic acid, 3-phenyldithio-propanoic acid, and 4-(2-pyridyldithio)pentanoic acid. Esterification of the C-17 hydroxy group can also be achieved by reaction with an appropriately protected thiol group-containing carboxylic acid chloride, such as 3S-acetylpropanoyl chloride. Other methods of esterification can also be used as described in the literature (Haslam, Tetrahedron, 36:2400-2433 (1980)). The protected or free thiol-containing androgen or estrogen can then be reacted with a disulfide or thiol-containing maytansinoid to produce conjugates. The conjugates can be purified by column chromatography on silica gel or by HPLC.
Preferably monoclonal antibody or cell binding agent/maytansinoid conjugates are those that are joined via a disulfide bond, as discussed above, that are capable of delivering maytansinoid molecules. Such cell binding conjugates are prepared by known methods such as modifying monoclonal antibodies with succinimidyl pyridyl-dithiopropionate (SPDP) or SPP (Carlsson et al, Biochem. J., 173:723-737 (1978)). The resulting thiopyridyl group is then displaced by treatment with thiol-containing maytansinoids to produce disulfide linked conjugates. Alternatively, in the case of the aryldithio-maytansinoids, the formation of the cell binding conjugate is effected by direct displacement of the aryl-thiol of the maytansinoid by sulfhydryl groups previously introduced into antibody molecules. Conjugates containing 1 to 10 maytansinoid drugs linked via a disulfide bridge are readily prepared by either method.
More specifically, a solution of the dithiopyridyl modified antibody at a concentration of 2.5 mg/ml in 0.05 M potassium phosphate buffer and 0.05 M sodium chloride, at pH 6.5 containing 2 mM EDTA is treated with the thiol-containing maytansinoid (1.7 molar equivalent/dithiopyridyl group). The release of pyridine-2-thione from the modified antibody is monitored spectrophotometrically at 343 nm. The reaction is allowed to proceed up to 18 hours. The antibody-maytansinoid conjugate is purified and freed of unreacted drug and other low molecular weight material by gel filtration through a column of Sephacryl S-300. The number of maytansinoids bound per antibody molecule can be determined by measuring the ratio of the absorbance at 252 nm and 280 nm. An average of 1-10 maytansinoid molecules/antibody molecule can be linked via disulfide bonds by this method.
Antibody-maytansinoid conjugates with non-cleavable links can also be prepared. The antibody can be modified with crosslinking reagents such as succinimidyl 4-(N-maleimidomethyl)-cyclohexane-1-carboxylate (SMCC), sulfo-SMCC, maleimidobenzoyl-N-hydroxysuccinimide ester (MBS), sulfo-MBS or succinimidyl-iodoacetate, as described in the literature, to introduce 1-10 reactive groups (Yoshitake et al, Eur. J. Biochem., 101:395-399 (1979); Hashida et al, J. Applied Biochem., 56-63 (1984); and Liu et al, Biochem., 18:690-697 (1979)). The modified antibody is then reacted with the thiol-containing maytansinoid derivative to produce a conjugate. The conjugate can be purified by gel filtration through a Sephacryl S-300 column.
The modified antibodies are treated with the thiol-containing maytansinoid (1.25 molar equivalent/maleimido group). The mixtures are incubated overnight at about 4° C. The antibody-maytansinoid conjugates are purified by gel filtration through a Sephadex G-25 column. Typically, an average of 1-10 maytansinoids per antibody are linked.
A preferred method is to modify antibodies with succinimidyl 4-(N-maleimidomethyl)-cyclohexane-1-carboxylate (SMCC) to introduce maleimido groups followed by reaction of the modified antibody with a thiol-containing maytansinoid to give a thioether-linked conjugate. Again conjugates with 1 to 10 drug molecules per antibody molecule result.
As described herein, the present invention is based on the unexpected discovery that the use of at least one immunoconjugate and at least one chemotherapeutic agent produces superior results in treating cancer. Any chemotherapeutic agent known in the art can be used in combination with the immunoconjugate of the present invention to achieve the unexpectedly superior results described and demonstrated herein. Preferably, the chemotherapeutic agent is a taxane compound, a compound that acts via a taxane mechanism, a platinum compound, an epidophyllotoxin compound, a camptothecin compound, and/or any combination thereof. As is known in the art, platinum compounds and epidophyllotoxin compounds are generally used together for treating cancer.
In one embodiment, the present invention provides methods of treating cancer and/or modulating the growth of selected cell populations (e.g., cancer cells) by administering at least one immunoconjugate and at least one taxane compound. In another embodiment, the present invention provides methods of treating cancer and/or modulating the growth of selected cell populations (e.g., cancer cells) by administering at least one immunoconjugate and at least one compound that acts via a taxane mechanism. In another embodiment, the present invention provides methods of treating cancer and/or modulating the growth of selected cell populations (e.g., cancer cells) by administering at least one immunoconjugate, and at least one platinum compound. In another embodiment, the present invention provides methods of treating cancer and/or modulating the growth of selected cell populations (e.g., cancer cells) by administering at least one immunoconjugate, at least one platinum compound, and at least one epidophyllotoxin compound. In another embodiment, the present invention provides methods of treating cancer and/or modulating the growth of selected cell populations (e.g., cancer cells) by administering at least one immunoconjugate and at least one camptothecin compound. In another embodiment, the present invention provides methods of treating cancer and/or modulating the growth of selected cell populations (e.g., cancer cells) by administering at least one immunoconjugate and at least one compound that is capable of inhibiting DNA topoisomerase I. In yet another embodiment, the present invention provides methods of treating cancer and/or modulating the growth of selected cell populations (e.g., cancer cells) by administering at least one immunoconjugate, at least one taxane compound, and at least one platinum compound. In yet another embodiment, the present invention provides methods of treating cancer and/or modulating the growth of selected cell populations (e.g., cancer cells) by administering at least one immunoconjugate, at least one taxane compound, at least one platinum compound, and, optionally, at least one epidophyllotoxin compound. In yet another embodiment, the present invention provides methods of treating cancer and/or modulating the growth of selected cell populations (e.g., cancer cells) by administering at least one immunoconjugate, at least one camptothecin compound, at least one platinum compound and, optionally, at least one epidophyllotoxin compound. In yet another embodiment, the present invention provides methods of treating cancer and/or modulating the growth of selected cell populations (e.g., cancer cells) by administering at least one immunoconjugate, at least one compound that acts via a taxane mechanism and at least one camptothecin compound. One skilled in the art will appreciate that the methods described in the present invention encompass administering at least one immunoconjugate with one or more chemotherapeutic agents selected from the group consisting of taxane compounds, compounds that act through a taxane mechanism, platinum compounds, epidophyllotoxin compounds, camptothecin compounds and compounds that can inhibit DNA topoisomerase I. In the methods of the present invention, the immunoconjugate and chemotherapeutic agent can be administered simultaneously, about the same time, or at different times, or can be components of a single composition.
Taxane compounds prevent the growth of cancer cells by affecting cell structures called microtubules, which play an important role in cell functions. In normal cell growth, microtubules are formed when a cell starts dividing. Once the cell stops dividing, the microtubules are broken down or destroyed. Taxane compounds stop the microtubules from breaking down, such that the cancer cells become clogged with microtubules so that they cannot grow and divide.
Taxane compounds are known in the art and include, for example, paclitaxel (available as TAXOL® from Bristol-Myers Squibb, Princeton, N.J.), docetaxel (available as TAXOTERE® from Aventis), and the like. Other taxane compounds that become approved by the U.S. Food and Drug Administration (FDA) or foreign counterparts thereof are also preferred for use in the methods and compositions of the present invention. Other taxane compounds that can be used in the present invention include those described, for example, in 10th NCI-EORTC Symposium on New Drugs in Cancer Therapy, Amsterdam, page 100, Nos. 382 and 383 (Jun. 16-19, 1998); and U.S. Pat. Nos. 4,814,470, 5,721,268, 5,714,513, 5,739,362, 5,728,850, 5,728,725, 5,710,287, 5,637,484, 5,629,433, 5,580,899, 5,549,830, 5,523,219, 5,281,727, 5,939,567, 5,703,117, 5,480,639, 5,250,683, 5,700,669, 5,665,576, 5,618,538, 5,279,953, 5,243,045, 5,654,447, 5,527,702, 5,415,869, 5,279,949, 5,739,016, 5,698,582, 5,478,736, 5,227,400, 5,516,676, 5,489,601, 5,908,759, 5,760,251, 5,578,739, 5,547,981, 5,547,866, 5,344,775, 5,338,872, 5,717,115, 5,620,875, 5,284,865, 5,284,864, 5,254,703, 5,202,448, 5,723,634, 5,654,448, 5,466,834, 5,430,160, 5,407,816, 5,283,253, 5,719,177, 5,670,663, 5,616,330, 5,561,055, 5,449,790, 5,405,972, 5,380,916, 5,912,263, 8,808,113, 5,703,247, 5,618,952, 5,367,086, 5,200,534, 5,763,628, 5,705,508, 5,622,986, 5,476,954, 5,475,120, 5,412,116, 5,916,783, 5,879,929, 5,861,515, 5,795,909, 5,760,252, 5,637,732, 5,614,645, 5,599,820, 5,310,672, RE 34,277, U.S. Pat. Nos. 5,877,205, 5,808,102, 5,766,635, 5,760,219, 5,750,561, 5,637,723, 5,475,011, 5,256,801, 5,900,367, 5,869,680, 5,728,687, 5,565,478, 5,411,984, 5,334,732, 5,919,815, 5,912,264, 5,773,464, 5,670,673, 5,635,531, 5,508,447, 5,919,816, 5,908,835, 5,902,822, 5,880,131, 5,861,302, 5,850,032, 5,824,701, 5,817,867, 5,811,292, 5,763,477, 5,756,776, 5,686,623, 5,646,176, 5,621,121, 5,616,739, 5,602,272, 5,587,489, 5,567,614, 5,498,738, 5,438,072, 5,403,858, 5,356,928, 5,274,137, 5,019,504, 5,917,062, 5,892,063, 5,840,930, 5,840,900, 5,821,263, 5,756,301, 5,750,738, 5,750,562, 5,726,318, 5,714,512, 5,686,298, 5,684,168, 5,681,970, 5,679,807, 5,648,505, 5,641,803, 5,606,083, 5,599,942, 5,420,337, 5,407,674, 5,399,726, 5,322,779, 4,924,011, 5,939,566, 5,939,561, 5,935,955, 5,919,455, 5,854,278, 5,854,178, 5,840,929, 5,840,748, 5,821,363, 5,817,321, 5,814,658, 5,807,888, 5,792,877, 5,780,653, 5,770,745, 5,767,282, 5,739,359, 5,726,346, 5,717,103, 5,710,099, 5,698,712, 5,683,715, 5,677,462, 5,670,653, 5,665,761, 5,654,328, 5,643,575, 5,621,001, 5,608,102, 5,606,068, 5,587,493, 5,580,998, 5,580,997, 5,576,450, 5,574,156, 5,571,917, 5,556,878, 5,550,261, 5,539,103, 5,532,388, 5,470,866, 5,453,520, 5,384,399, 5,364,947, 5,350,866, 5,336,684, 5,296,506, 5,290,957, 5,274,124, 5,264,591, 5,250,722, 5,229,526, 5,175,315, 5,136,060, 5,015,744, 4,924,012, 6,118,011, 6,114,365, 6,107,332, 6,072,060, 6,066,749, 6,066,747, 6,051,724, 6,051,600, 6,048,990, 6,040,330, 6,030,818, 6,028,205, 6,025,516, 6,025,385, 6,018,073, 6,017,935, 6,011,056, 6,005,138, 6,005,138, 6,005,120, 6,002,023, 5,998,656, 5,994,576, 5,981,564, 5,977,386, 5,977,163, 5,965,739, 5,955,489, 5,939,567, 5,939,566, 5,919,815, 5,912,264, 5,912,263, 5,908,835, and 5,902,822, the disclosures of which are incorporated by reference herein in their entirety.
Other compounds that can be used in the invention are those that act through a taxane mechanism. Compounds that act through a taxane mechanism include compounds that have the ability to exert microtubule-stabilizing effects and cytotoxic activity against rapidly proliferating cells, such as tumor cells or other hyperproliferative cellular diseases. Such compounds include, for example, epothilone compounds, such as, for example, epothilone A, B, C, D, E and F, and derivatives thereof. Other compounds that act through a taxane mechanism (e.g., epothilone compounds) that become approved by the FDA or foreign counterparts thereof are also preferred for use in the methods and compositions of the present invention. Epothilone compounds and derivatives thereof are known in the art and are described, for example, in U.S. Pat. Nos. 6,121,029, 6,117,659, 6,096,757, 6,043,372, 5,969,145, and 5,886,026; and WO 97/19086, WO 98/08849, WO 98/22461, WO 98/25929, WO 98/38192, WO 99/01124, WO 99/02514, WO 99/03848, WO 99/07692, WO 99/27890, and WO 99/28324, the disclosures of which are incorporated herein by reference in their entirety.
Other compounds that can be used in the invention include platinum compounds such as, for example, cisplatin (available as PLATINOL® from Bristol-Myers Squibb, Princeton, N.J.), carboplatin (available as PARAPLATIN® from Bristol-Myers Squibb, Princeton, N.J.), oxaliplatin (available as ELOXATINE® from Sanofi, France), iproplatin, ormaplatin, tetraplatin, and the like. Other platinum compounds that become approved by the FDA or foreign counterparts thereof are also preferred for use in the methods and compositions of the present invention. Platinum compounds that are useful in treating cancer are known in the art and are described, for example in U.S. Pat. Nos. 4,994,591, 4,906,646, 5,902,610, 5,053,226, 5,789,000, 5,871,710, 5,561,042, 5,604,095, 5,849,790, 5,705,334, 4,863,902, 4,767,611, 5,670,621, 5,384,127, 5,084,002, 4,937,262, 5,882,941, 5,879,917, 5,434,256, 5,393,909, 5,117,022, 5,041,578, 5,843,475, 5,633,243, 5,178,876, 5,866,169, 5,846,725, 5,646,011, 5,527,905, 5,844,001, 5,832,931, 5,676,978, 5,604,112, 5,562,925, 5,541,232, 5,426,203, 5,288,887, 5,041,581, 5,002,755, 4,946,954, 4,921,963, 4,895,936, 4,686,104, 4,594,238, 4,581,224, 4,250,189, 5,829,448, 5,690,905, 5,665,771, 5,648,384, 5,633,016, 5,460,785, 5,395,947, 5,256,653, 5,132,323, 5,130,308, 5,106,974, 5,059,591, 5,026,694, 4,992,553, 4,956,459, 4,956,454, 4,952,676, 4,895,935, 4,892,735, 4,843,161, 4,760,156, 4,739,087, 4,720,504, 4,544,759, 4,515,954, 4,466,924, 4,462,998, 4,457,926, 4,428,943, 4,325,950, 4,291,027, 4,291,023, 4,284,579, 4,271,085, 4,234,500, 4,234,499, 4,200,583, 4,175,133, 4,169,846, 5,922,741, 5,922,674, 5,922,302, 5,919,126, 5,910,102, 5,876,693, 5,871,923, 5,866,617, 5,866,615, 5,866,593, 5,864,024, 5,861,139, 5,859,034, 5,855,867, 5,855,748, 5,849,770, 5,843,993, 5,824,664, 5,821,453, 5,811,119, 5,798,373, 5,786,354, 5,780,478, 5,780,477, 5,776,925, 5,770,593, 5,770,222, 5,747,534, 5,739,144, 5,738,838, 5,736,156, 5,736,119, 5,723,460, 5,697,902, 5,693,659, 5,688,773, 5,674,880, 5,670,627, 5,665,343, 5,654,287, 5,648,362, 5,646,124, 5,641,627, 5,635,218, 5,633,257, 5,632,982, 5,622,977, 5,622,686, 5,618,393, 5,616,613, 5,612,019, 5,608,070, 5,595,878, 5,585,112, 5,580,888, 5,580,575, 5,578,590, 5,575,749, 5,573,761, 5,571,153, 5,563,132, 5,561,136, 5,556,609, 5,552,156, 5,547,982, 5,542,935, 5,525,338, 5,519,155, 5,498,227, 5,491,147, 5,482,698, 5,469,854, 5,455,270, 5,443,816, 5,415,869, 5,409,915, 5,409,893, 5,409,677, 5,399,694, 5,399,363, 5,380,897, 5,340,565, 5,324,591, 5,318,962, 5,302,587, 5,292,497, 5,272,056, 5,258,376, 5,238,955, 5,237,064, 5,213,788, 5,204,107, 5,194,645, 5,182,368, 5,130,145, 5,116,831, 5,106,858, 5,100,877, 5,087,712, 5,087,618, 5,078,137, 5,057,302, 5,049,396, 5,034,552, 5,028,726, 5,011,846, 5,010,103, 4,985,416, 4,970,324, 4,936,465, 4,931,553, 4,927,966, 4,912,072, 4,906,755, 4,897,384, 4,880,832, 4,871,528, 4,822,892, 4,783,452, 4,767,874, 4,760,155, 4,687,780, 4,671,958, 4,665,210, 4,645,661, 4,599,352, 4,594,418, 4,593,034, 4,587,331, 4,575,550, 4,562,275, 4,550,169, 4,482,569, 4,431,666, 4,419,351, 4,407,300, 4,394,319, 4,335,087, 4,329,299, 4,322,391, 4,302,446, 4,287,187, 4,278,660, 4,273,755, 4,255,417, 4,255,347, 4,248,840, 4,225,529, 4,207,416, 4,203,912, 4,177,263, 4,151,185, 4,140,707, 4,137,248, 4,115,418, 4,079,121, 4,075,307, 3,983,118, 3,870,719, RE 33,071, U.S. Pat. Nos. 6,087,392, 6,077,864, 5,998,648, and 5,902,610, the disclosures of which are incorporated by reference herein in their entirety.
As is known in the art, platinum compounds are preferably used in combination with at least one epipodophyllotoxin compound, including, for example, etoposide (also known as VP-16) (available as VEPESID® from Bristol-Myers Squibb, Princeton, N.J.), teniposide (also known as VM-26) (available as VUMON® from Bristol-Myers Squibb, Princeton, N.J.), and the like. Other epipodophyllotoxin compounds that become approved by the FDA or foreign counterparts thereof are also preferred for use in the methods and compositions of the present invention. Other epipodophyllotoxin compounds that can be used in the present invention include those described, for example, in U.S. Pat. Nos. 3,524,844, 5,643,885, 5,066,645, 5,081,234, 5,891,724, 5,489,698, 5,821,348, 5,571,914, 4,997,931, 4,547,567, 5,536,847, 5,326,753, 5,120,862, 5,011,948, 4,895,727, 4,795,819, 4,644,072, 5,688,926, 5,676,978, 5,660,827, 5,395,610, 5,346,897, 5,208,238, 5,190,949, 5,086,182, 4,965,348, 4,958,010, 4,874,851, 4,866,189, 4,853,467, 4,728,740, 4,716,221, 5,935,955, 5,863,538, 5,855,866, 5,776,427, 5,747,520, 5,739,114, 5,622,960, 5,606,060, 5,605,826, 5,541,223, 5,459,248, 5,455,161, 5,364,843, 5,300,500, 5,041,424, 5,036,055, 5,034,380, 4,935,504, 4,916,217, 4,912,204, 4,904,768, 4,900,814, 4,888,419, 4,567,253, RE 35,524, U.S. Pat. Nos. 6,107,284, 6,063,801, and 6,051,230, the disclosures of which are incorporated herein by reference in their entirety.
Other compounds that can be used in the present invention include camptothecin compounds. Camptothecin compounds are capable of inhibiting DNA topoisomerase I. Camptothecin compounds include camptothecin, derivatives of camptothecin and analogs of camptothecin. Camptothecin compounds are known in the art and include, for example, camptothecin, topotecan (available as HYCAMTIN® from SmithKline Beecham Pharmaceuticals), CPT-11 (also called irinotecan), 9-aminocamptothecin, and the like. Other camptothecin compounds (or other compounds that can inhibit DNA topoisomerase I) that become approved by the FDA or foreign counterparts thereof are also preferred for use in the methods and compositions of the present invention. Other camptothecin compounds that can be used in the present invention include those described in, for example, J. Med. Chem., 29:2358-2363 (1986); J. Med. Chem., 23:554 (1980); J. Med. Chem., 30:1774 (1987); European Patent Application Nos. 0 418 099, 0 088 642, and 0 074 770; and U.S. Pat. Nos. 5,633,016, 5,004,758, 4,604,463, 4,473,692, 4,545,880, 4,513,138, 4,399,276, 6,121,451, 6,121,278, 6,121,277, 6,121,275, 6,121,263, 6,107,486, 6,100,273, 6,096,336, 6,093,721, 6,063,801, 6,046,209, 6,040,313, 6,034,243, 6,028,078, 5,998,426, 5,990,120, 5,985,888, 5,981,542, 5,972,955, 5,968,943, 5,958,937, 5,955,467, 5,948,797, 5,935,967, 5,932,709, 5,932,588, 5,922,877, 5,916,897, 5,916,896, 5,910,491, 5,900,419, 5,892,043, 5,889,017, 5,880,133, 5,859,023, 5,859,022, 5,856,333, 5,843,954, 5,840,899, 5,837,673, 5,834,012, 5,807,874, 5,801,167, 5,786,344, 5,773,522, 5,767,142, 5,744,605, 5,734,056, 5,731,316, 5,726,181, 5,677,286, 5,674,874, 5,674,873, 5,670,500, 5,633,177, 5,652,244, 5,646,159, 5,633,260, 5,614,628, 5,604,233, 5,602,141, 5,597,829, 5,559,235, 5,552,154, 5,541,327, 5,525,731, 5,496,952, 5,475,108, 5,468,859, 5,468,754, 5,459,269, 5,447,936, 5,446,047, 5,401,747, 5,391,745, 5,364,858, 5,340,817, 5,244,903, 5,227,380, 5,200,524, 5,191,082, 5,180,722, 5,162,532, 5,122,606, 5,122,526, 5,106,742, 5,061,800, 5,053,512, 5,049,668, 5,004,758, 4,981,968, 4,943,579, 4,939,255, 4,914,205, 4,894,456, RE 32,518, U.S. Pat. Nos. 4,604,463, 4,513,138, 4,473,692, 4,399,282, 4,399,276, and 4,031,098, the disclosures of which are incorporated by reference herein in their entirety.
The immunoconjugates and chemotherapeutic agents of the present invention can be administered in vitro, in vivo and/or ex vivo to treat patients and/or to modulate the growth of selected cell populations including, for example, cancer of the lung, breast, colon, prostate, kidney, pancreas, brain, bones, ovary, testes, and lymphatic organs; autoimmune diseases, such as systemic lupus, rheumatoid arthritis, and multiple sclerosis; graft rejections, such as renal transplant rejection, liver transplant rejection, lung transplant rejection, cardiac transplant rejection, and bone marrow transplant rejection; graft versus host disease; viral infections, such as CMV infection, HIV infection, and AIDS; and parasite infections, such as giardiasis, amoebiasis, schistosomiasis, and the like. Preferably, the immunoconjugates and chemotherapeutic agents of the invention are administered in vitro, in vivo and/or ex vivo to treat cancer in a patient and/or to modulate the growth of cancer cells, including, for example, cancer of the lung, breast, colon, prostate, kidney, pancreas, brain, bones, ovary, testes, and lymphatic organs; more preferably lung cancer or colon cancer. In a most preferred embodiment, the lung cancer is small cell lung cancer (SCLC).
“Modulating the growth of selected cell populations” includes inhibiting the proliferation of selected cell populations (e.g., SCLC cells, NCI N417 cells, SW-2 cells, NCI-H441 cells, HT-29 cells, and the like) from dividing to produce more cells; reducing the rate of increase in cell division as compared, for example, to untreated cells; killing selected cell populations; and/or preventing selected cell populations (such as cancer cells) from metastasizing. The growth of selected cell populations can be modulated in vitro, in vivo or ex vivo.
In the methods of the present invention, the immunoconjugates and chemotherapeutic agents can be administered in vitro, in vivo, or ex vivo separately or as components of the same composition. The immunoconjugates and chemotherapeutic agents can be used with suitable pharmaceutically acceptable carriers, diluents, and/or excipients, which are well known, and can be determined by one of skill in the art as the clinical situation warrants. Examples of suitable carriers, diluents and/or excipients include: (1) Dulbecco's phosphate buffered saline, pH about 6.5, which would contain about 1 mg/ml to 25 mg/ml human serum albumin, (2) 0.9% saline (0.9% w/v NaCl), and (3) 5% (w/v) dextrose.
The compounds and compositions described herein may be administered in appropriate form, preferably parenterally, more preferably intravenously. For parenteral administration, the compounds or compositions can be aqueous or nonaqueous sterile solutions, suspensions or emulsions. Propylene glycol, vegetable oils and injectable organic esters, such as ethyl oleate, can be used as the solvent or vehicle. The compositions can also contain adjuvants, emulsifiers or dispersants. The compositions can also be in the form of sterile solid compositions which can be dissolved or dispersed in sterile water or any other injectable sterile medium.
The “therapeutically effective amount” of the chemotherapeutic agents and immunoconjugates described herein refers to the dosage regimen for inhibiting the proliferation of selected cell populations and/or treating a patient's disease, and is selected in accordance with a variety of factors, including the age, weight, sex, diet and medical condition of the patient, the severity of the disease, the route of administration, and pharmacological considerations, such as the activity, efficacy, pharmacokinetic and toxicology profiles of the particular compound used. The “therapeutically effective amount” can also be determined by reference to standard medical texts, such as the Physicians Desk Reference 1999 (53rd Ed.), the disclosure of which is incorporated by reference herein in its entirety. The patient is preferably an animal, more preferably a mammal, most preferably a human. The patient can be male or female, and can be an infant, child or adult.
Examples of suitable protocols of immunoconjugate administration are as follows. Immunoconjugates can be given daily for about 5 days either as an i.v. bolus each day for about 5 days, or as a continuous infusion for about 5 days. Alternatively, they can be administered once a week for six weeks or longer. As another alternative, they can be administered once every two or three weeks. Bolus doses are given in about 50 to about 400 ml of normal saline to which about 5 to about 10 ml of human serum albumin can be added. Continuous infusions are given in about 250 to about 500 ml of normal saline, to which about 25 to about 50 ml of human serum albumin can be added, per 24 hour period. Dosages will be about 10 μg to about 1000 mg/kg per person, i.v. (range of about 100 ng to about 10 mg/kg). About one to about four weeks after treatment, the patient can receive a second course of treatment. Specific clinical protocols with regard to route of administration, excipients, diluents, dosages, and times can be determined by the skilled artisan as the clinical situation warrants.
The present invention also provides pharmaceutical kits comprising one or more containers filled with one or more of the ingredients of the pharmaceutical compounds and/or compositions of the present invention, including, one or more immunoconjugates and one or more chemotherapeutic agents. Such kits can also include, for example, other compounds and/or compositions, a device(s) for administering the compounds and/or compositions, and written instructions in a form prescribed by a governmental agency regulating the manufacture, use or sale of pharmaceuticals or biological products.
The following examples are for purposes of illustration only, and are not intended to limit the scope of the invention or claims.
The maytansinoid DM1 was conjugated to the humanized monoclonal antibody N901.
Ansamitocin P-3, provided by Takeda (Osaka, Japan) was converted to the disulfide-containing maytansinoid DM1, as described herein and in U.S. Pat. No. 5,208,020, the disclosure of which is incorporated by reference herein in its entirety.
##STR00007##
Humanized N901 is an antibody that binds to the CD56 antigen expressed on all human small cell lung cancer (SCLC) tissues, neuroblastomas and carcinoid tumors (Doria et al, Cancer 62:1839-1845 (1988); Kibbelaar et al, Eur. J. Cancer, 27:431-435 (1991);Rygaard et al, Br. J. Cancer, 65:573-577 (1992)).
Humanized N901 was modified with N-succinimidyl-4-[2-pyridyldithio]-pentanoate (SPP) to introduce dithiopyridyl groups. Alternatively, N-succinimidyl-3-[2-pyridyldithio]-propanoate (SPDP) can be used. The antibody (8 mg/mL) in 50 mM potassium phosphate buffer, pH 6.5, containing NaCl (50 mM) and EDTA (2 mM) was treated with SPP (5.6 molar equivalents in ethanol). The final ethanol concentration was 5% (v/v). After 90 minutes at ambient temperature, the reaction mixture was gel filtered through a Sephadex G25 column equilibrated in the above buffer. Antibody-containing fractions were pooled and the degree of modification was determined by treating a sample with dithiothreitol and measuring the change in absorbance at 343 nm (release of 2-mercaptopyridine with ε343 nm=8,080 M−1). Recovery of the antibody was typically 90%, with 4.8 pyridyldithio groups linked per antibody molecule.
The modified antibody was diluted with 50 mM potassium phosphate buffer, 6.5, containing NaCl (50 mM) and EDTA (2 mM) to a final concentration of 2.5 mg/mL. DM1 (1.7 eq.) in dimethylacetamide (DMA, 3% v/v in final reaction mixture) was then added to the modified antibody solution. The reaction proceeded at ambient temperature under argon for 20 hours.
The reaction mixture was then loaded on to a Sephacryl S300 gel filtration column equilibrated with phosphate-buffered saline (PBS, pH 6.5). The major peak comprised monomeric hu901-DM1. The number of DM1 drug molecules linked per antibody molecule was determined by measuring the absorbance at 252 nm and 280 nm and found to be 3.9 DM1 molecules per antibody molecule.
In this experiment, a low, non-curative dose of huN901-DM1 was used with an optimal does of paclitaxel (Sigma Chemical Co., St. Louis, Mo.). SCID mice (7 animals per group) were inoculated subcutaneously with NCI N417 cells (8×106 cells/animal). After the tumors were well-established (average tumor size was approximately 100 mm3), one group of animals was treated with huN901-DM1 at a DM1 dose of 75 μg/kg/d×5, administered i.v. everyday. A second group of animals was treated with paclitaxel at a dose of 10 mg/kg/d×5, administered by i.p. everyday. A third group of animals was treated with huN901-DM1 and paclitaxel using the same dose and schedule used for the individual agents. A fourth, control group of animals was left untreated. Tumor size was measured as described by Liu et al, Proc. Natl. Acad. Sci., 93:8618-8623 (1996). Animals were also monitored for weight loss as an indicator of signs of toxicity.
The results of the experiment are shown in
In this experiment, a low, non-curative dose of huN901-DM1 was used with an optimal dose of cisplatin (Sigma Chemical Co., St. Louis, Mo.) and etoposide (Sigma Chemical Co., St. Louis, Mo.). SCID mice (7 animals per group) were inoculated subcutaneously with NCI N417 cells (8×106 cells/animal). After the tumors were well-established (average tumor size was approximately 100 mm3), one group of animals was treated with huN901-DM1 at a DM1 dose of 75 μg/kg/d×5, administered i.v. everyday. A second group of animals was treated with cisplatin (at a dose of 2 mg/kg/d×3, administered by i.v. ever other day) and etoposide (at a dose of 8 mg/kg/d×3, administered every other day). A third group of animals was treated with huN901-DM1, cisplatin and etoposide using the same dose and schedule used for a the individual agents. A fourth, control group of animals was left untreated. Tumor size was measured as described by Liu et al, Proc. Natl. Acad. Sci., 93:8618-8623 (1996). Animals were also monitored for weight loss as an indicator of signs of toxicity.
The results of the experiment are shown in
The anti-tumor effect of a combination of a low dose of huN901-DM1 and docetaxel (available as TAXOTERE® from Aventis) was evaluated in an established subcutaneous xenograft model of small cell lung cancer. SCID mice (24 animals) were inoculated with human small cell lung cancer SW-2 cells (8×106 cells/animal) injected subcutaneously into the right flank of the mice. When the tumors reached about 100 mm3 in size (10 days after tumor cell inoculation), the mice were randomly divided into four groups (6 animals per group). The first group of mice was treated with docetaxel (5 mg/kg×5, q2d) administered i.v. A second group of animals was treated with huN901-DM1 (DM1 dose of 75 μg/kg×5, qd) administered i.v. The third group of mice received a combination of docetaxel and huN901-DM1, using the same doses and schedules as in groups 1 and 2. A control group of animals received phosphate-buffered saline (PBS) using the same schedule as the animals in group 2. Tumor growth was monitored by measuring tumor size twice per week. Tumor size was calculated with the formula: length×width×height×½.
The change in tumor size is shown in
The anti-tumor effect of a combination of a low dose of huN901-DM1 and topotecan (available as HYCAMTIN® from SmithKline Beecham Pharmaceuticals), one of the approved drugs for the treatment of small cell lung cancer (SCLC) in humans, was evaluated in an established subcutaneous xenograft model of SCLC. SCID mice (24 animals) were inoculated with human small cell lung cancer SW-2 cells (8×106 cells/animal) injected subcutaneously into the right flank of the mice. When the tumors reached about 80 mm3 in size, the mice were randomly divided into four groups (6 animals per group). The first group of mice was treated with topotecan (1.4 mg/kg×5, qd) administered i.v. A second group of animals was treated with huN901-DM1 (DM1 dose of 100 μg/kg×5, qd) administered i.v. The third group of mice received a combination of topotecan and huN901-DM1, using the same doses and schedules as in groups 1 and 2. A control group of animals received phosphate-buffered saline (PBS) using the same schedule as the animals in group 2. Tumor growth was monitored by measuring tumor size twice per week. Tumor size was calculated using the formula: length×width×height×½.
The change in tumor size is shown in
The anti-tumor effect of a combination of a low dose of huC242-DM1 (manufactured by ImmunoGen, Inc. following the procedures described in U.S. Pat. No. 5,208,020, the disclosure of which is incorporated by reference herein in its entirety, and also described in Example 1) and paclitaxel (Sigma Chemical Co., St. Louis, Mo.) was evaluated in an established subcutaneous xenograft model of non-small cell lung cancer. SCID mice (24 animals) were inoculated with human lung adenocarcinoma NCI-H441 cells (8×106 cells/animal), injected subcutaneously into the right flank of the mice. When the tumors reached about 125 mm3 in size (4 days after tumor cell inoculation), the mice were randomly divided into four groups (6 animals per group). The first group of mice was treated with paclitaxel (15 mg/kg×5, q2d) administered i.p. A second group of animals was treated with huC242-DM1 (DM1 dose of 75 μg/kg×5, qd) administered i.v. The third group of mice received a combination of paclitaxel and huC242-DM1, using the same doses and schedules as in groups 1 and 2. In the combination group, the huC242-DM1 conjugate was administered 2 hours after the paclitaxel. A control group of animals received phosphate-buffered saline (PBS) using the same schedule as the animals in group 2. Tumor growth was monitored by measuring tumor size twice per week. Tumor size was calculated using the formula: length×width×height×½.
The change in tumor size is shown in
The anti-tumor effect of a combination of a low dose of huC242-DM1 (manufactured by ImmunoGen, Inc. following the methods described in U.S. Pat. No. 5,208,020, the disclosure of which is incorporated by reference herein in its entirety, and also described in Example 1) and paclitaxel (Sigma Chemical Co., St. Louis, Mo.) was evaluated in an established subcutaneous xenograft model of non-small cell lung cancer. SCID mice (32 animals) were inoculated with human colon cancer HT-29 cells (8×106 cells/animal), injected subcutaneously into the right flank of the mice. When the tumors reached about 80 mm3 in size, the mice were randomly divided into four groups (8 animals per group). The first group of mice was treated with CPT-11 (50 mg/kg×2, q3d) administered i.v. The second group of animals was treated with murine C242-DM1 (DM1 dose of 75 μg/kg×5, qd) administered i.v. The third group of mice received a combination of CPT-11 and C242-DM1, using the same doses and schedules as in groups 1 and 2. A control group of animals received phosphate-buffered saline (PBS) using the same schedule as the animals in group 2. Tumor growth was monitored by measuring tumor size twice per week. Tumor size was calculated using the formula: length×width×height×½.
The change in tumor size is shown in
Each of the patents and publications cited in the specification is incorporated by reference herein in its entirety.
Various modifications of the invention, in addition to those described herein, will be apparent to one skilled in the art from the foregoing description. Such modifications are intended to fall within the scope of the appended claims.
Chari, Ravi V. J., Blättler, Walter A.
| Patent | Priority | Assignee | Title |
| 8597654, | May 13 2005 | Genentech, Inc. | Adjuvant therapy with an anti-ERBB2 antibody conjugated to a maytansiniod |
| 8790649, | Oct 29 2010 | IMMUNOGEN, INC | EGFR-binding molecules and immunoconjugates thereof |
| 9125896, | Oct 29 2010 | ImmunoGen, Inc. | EGFR-binding molecules and immunoconjugates thereof |
| 9233171, | Nov 21 2011 | IMMUNOGEN, INC | Method of treatment of tumors that are resistant to EGFR antibody therapies by EGFR antibody cytotoxic agent conjugate |
| Patent | Priority | Assignee | Title |
| 3896111, | |||
| 4137230, | Nov 14 1977 | Takeda Chemical Industries, Ltd. | Method for the production of maytansinoids |
| 4151042, | Mar 31 1977 | Takeda Chemical Industries, Ltd. | Method for producing maytansinol and its derivatives |
| 4248870, | Oct 18 1979 | Takeda Chemical Industries, Ltd. | Maytansinoids and use |
| 4256746, | Nov 14 1978 | Takeda Chemical Industries | Dechloromaytansinoids, their pharmaceutical compositions and method of use |
| 4260608, | Nov 14 1978 | Takeda Chemical Industries, Ltd. | Maytansinoids, pharmaceutical compositions thereof and methods of use thereof |
| 4265814, | Mar 24 1978 | Takeda Chemical Industries | Matansinol 3-n-hexadecanoate |
| 4294757, | Jan 31 1979 | Takeda Chemical Industries, Ltd | 20-O-Acylmaytansinoids |
| 4307016, | Mar 24 1978 | Takeda Chemical Industries, Ltd | Demethyl maytansinoids |
| 4308268, | Jun 11 1979 | TAKEDA CHEMICAL INDUSTRIES, LTD , | Maytansinoids, pharmaceutical compositions thereof and method of use thereof |
| 4308269, | Jun 11 1979 | Takeda Chemical Industries, Ltd | Maytansinoids, pharmaceutical compositions thereof and method of use thereof |
| 4309428, | Jul 30 1979 | Takeda Chemical Industries, Ltd | Maytansinoids |
| 4313946, | Jan 27 1981 | The United States of America as represented by the Secretary of | Chemotherapeutically active maytansinoids from Trewia nudiflora |
| 4315929, | Jan 27 1981 | The United States of America as represented by the Secretary of | Method of controlling the European corn borer with trewiasine |
| 4317821, | Jun 08 1979 | Takeda Chemical Industries, Ltd | Maytansinoids, their use and pharmaceutical compositions thereof |
| 4322348, | Jun 05 1979 | Takeda Chemical Industries, Ltd | Maytansinoids |
| 4331598, | Sep 17 1980 | Takeda Chemical Industries, Ltd | Maytansinoids |
| 4361650, | Mar 24 1978 | Takeda Chemical Industries, Ltd. | Fermentation process of preparing demethyl maytansinoids |
| 4362663, | Sep 21 1979 | Takeda Chemical Industries, Ltd | Maytansinoid compound |
| 4364866, | Sep 21 1979 | Takeda Chemical Industries, Ltd | Maytansinoids |
| 4371533, | Oct 08 1980 | JAMES RIVER PAPER COMPANY, INC , A CORP OF VA | 4,5-Deoxymaytansinoids, their use and pharmaceutical compositions thereof |
| 4424219, | May 20 1981 | TAKEDA CHEMICAL INDUSTRIES LTD | 9-Thiomaytansinoids and their pharmaceutical compositions and use |
| 4450254, | Nov 03 1980 | Standard Oil Company | Impact improvement of high nitrile resins |
| 4968603, | Dec 31 1986 | Board of Regents, The University of Texas System | Determination of status in neoplastic disease |
| 4981979, | Sep 10 1987 | NeoRx Corporation | Immunoconjugates joined by thioether bonds having reduced toxicity and improved selectivity |
| 5183884, | Dec 01 1989 | United States of America | DNA segment encoding a gene for a receptor related to the epidermal growth factor receptor |
| 5208020, | Oct 25 1989 | IMMUNOGEN, INC | Cytotoxic agents comprising maytansinoids and their therapeutic use |
| 5217713, | Dec 27 1988 | Takeda Chemical Industries, Ltd. | Cytotoxic bispecific monoclonal antibody, its production and use |
| 5395924, | Mar 20 1986 | IMMUNOGEN, INC | Blocked lectins; methods and affinity support for making the same using affinity ligands; and method of killing selected cell populations having reduced non-selective cytotoxicity |
| 5416064, | Oct 25 1989 | IMMUNOGEN, INC | Cytotoxic agents comprising maytansinoids and their therapeutic use |
| 5480968, | Dec 04 1989 | GOVERNMENT OF THE UNITED STATES OF AMERICA, THE, AS REPRESENTED BY THE SECRETARY, DEPARTMENT OF HEALTH AND HUMAN SERVICES | Isolated polypeptide erbB-3, related to the epidermal growth factor receptor and antibody thereto |
| 5514554, | Aug 22 1991 | CELL ANALYSIS SYSTEMS, INC | Methods and compositions for cancer therapy and for prognosticating responses to cancer therapy |
| 5639641, | Sep 09 1992 | IMMUNOGEN, INC | Resurfacing of rodent antibodies |
| 5677171, | Jan 12 1988 | Genentech, Inc | Monoclonal antibodies directed to the HER2 receptor |
| 5679648, | Nov 30 1994 | UNIVERSITY HOSPITAL, THE | Methods for the treatment and prevention of fungal infections by administration of 3'-deoxypurine nucleosides |
| 5705157, | Jul 27 1989 | The Trustees of the University of Pennsylvania | Methods of treating cancerous cells with anti-receptor antibodies |
| 5725856, | Nov 28 1994 | Genentech, Inc. | Monoclonal antibodies directed to the HER2 receptor |
| 5747261, | Oct 21 1987 | The United States of America as represented by the Department of Health | Protein related to but distinct from EGF receptor and antibodies reactive therewith |
| 5772997, | Jan 12 1988 | Genentech, Inc. | Monoclonal antibodies directed to the HER2 receptor |
| 5783186, | Dec 05 1995 | AMGEN, INC | Antibody-induced apoptosis |
| 5821337, | Jun 14 1991 | Genentech, Inc | Immunoglobulin variants |
| 5824311, | Nov 30 1987 | Trustees of the University of Pennsylvania | Treatment of tumors with monoclonal antibodies against oncogene antigens |
| 5837234, | Jun 07 1995 | NEUROTECH USA, INC | Bioartificial organ containing cells encapsulated in a permselective polyether suflfone membrane |
| 5840525, | May 24 1991 | Genentech, Inc. | Nucleic acids, vectors and host cells encoding heregulin |
| 5877305, | Feb 06 1992 | Chiron Corporation | DNA encoding biosynthetic binding protein for cancer marker |
| 5919815, | May 22 1996 | LUITPOLD PHARMACEUTICALS, INC | Taxane compounds and compositions |
| 5968517, | May 23 1996 | Process for extraction of proanthocyanidins from botanical material | |
| 6022541, | Oct 18 1991 | Beth Israel Deaconess Medical Center | Immunological preparation for concurrent specific binding to spatially exposed regions of vascular permeability factor bound in-vivo to a tumor associated blood vessel |
| 6054297, | Jun 14 1991 | Genentech, Inc. | Humanized antibodies and methods for making them |
| 6333410, | Aug 18 2000 | IMMUNOGEN, INC | Process for the preparation and purification of thiol-containing maytansinoids |
| 6436931, | Nov 24 1999 | IMMUNOGEN, INC | Cytotoxic agents comprising taxanes and their therapeutic use |
| 6441163, | May 31 2001 | IMMUNOGEN, INC | Methods for preparation of cytotoxic conjugates of maytansinoids and cell binding agents |
| 6531131, | Aug 10 1999 | THE GOVERNMENT OF THE UNITED STATES REPRESENTED BY SECRETARY, DEPARTMENT OF HEALTH AND HUMAN SERVICES | Conjugate vaccine for Neisseria meningitidis |
| 6632979, | Mar 16 2000 | SAN VALLEY SYSTEMS, LLC | Rodent HER2 tumor model |
| 6949245, | Jun 25 1999 | Genentech, Inc | Humanized anti-ErbB2 antibodies and treatment with anti-ErbB2 antibodies |
| 7030231, | Sep 30 1999 | CATALYST BIOSCIENCES, INC | Membrane type serine protease 1 (MT-SP1) and uses thereof |
| 7097840, | Mar 16 2000 | IMMUNOGEN, INC | Methods of treatment using anti-ErbB antibody-maytansinoid conjugates |
| 7276497, | May 20 2003 | IMMUNOGEN, INC | Cytotoxic agents comprising new maytansinoids |
| 7303749, | Oct 01 1999 | IMMUNOGEN, INC | Compositions and methods for treating cancer using immunoconjugates and chemotherapeutic agents |
| 7375078, | Feb 23 2004 | SEAGEN INC | Heterocyclic self-immolative linkers and conjugates |
| 7485302, | Jan 27 2005 | Genentech, Inc. | Treatment with anti-ErbB2 antibodies and chemotherapeutic agents |
| 7498030, | Jun 25 1999 | Genetech, Inc. | Treatment with anti-ErbB2 antibodies and anti-hormonal compounds |
| 7501122, | Jun 25 1999 | Genentech, Inc. | Treatment with anti-ErbB2 antibody combinations |
| 7537931, | Jan 27 2005 | Genentech, Inc. | Humanized anti-ERBB2 antibodies and treatment with anti-ERBB2 antibodies |
| 7575748, | Mar 16 2000 | Genentech, Inc. | Methods of treatment using anti-ErbB antibody-maytansinoid conjugates |
| 7618631, | Jun 25 1999 | Genentech, Inc. | Treatment with anti-ErbB2 antibodies and EGFR-targeted drugs |
| 7862817, | Jun 25 1999 | Genentech, Inc. | Humanized anti-ErbB2 antibodies and treatment with anti-ErbB2 antibodies |
| 20020001587, | |||
| 20030086924, | |||
| 20040013667, | |||
| 20040235068, | |||
| 20040241174, | |||
| 20050133285, | |||
| 20050169933, | |||
| 20050238650, | |||
| 20050276812, | |||
| 20060216285, | |||
| 20070092940, | |||
| 20070184055, | |||
| 20070269429, | |||
| 20070269446, | |||
| 20080085283, | |||
| 20080114153, | |||
| 20080145374, | |||
| 20080166294, | |||
| 20080171040, | |||
| 20080171856, | |||
| 20080171865, | |||
| 20080226659, | |||
| 20090041791, | |||
| 20090202536, | |||
| 20110129464, | |||
| AU2003247762, | |||
| AU2003259913, | |||
| EP563475, | |||
| EP200425235, | |||
| JP10130168, | |||
| JP2002541088, | |||
| JP2002543093, | |||
| JP2003503365, | |||
| JP2003503395, | |||
| JP2003528034, | |||
| JP58167592, | |||
| JP62195387, | |||
| WO20579, | |||
| WO69460, | |||
| WO1000238, | |||
| WO1000244, | |||
| WO100245, | |||
| WO100594, | |||
| WO1015730, | |||
| WO124763, | |||
| WO216429, | |||
| WO3000113, | |||
| WO3024392, | |||
| WO3070234, | |||
| WO2004005470, | |||
| WO2004016225, | |||
| WO8906692, | |||
| WO9321319, | |||
| WO9400136, | |||
| WO9422478, | |||
| WO9616173, | |||
| WO9700271, | |||
| WO9704801, | |||
| WO9802463, | |||
| WO9808506, | |||
| WO9817797, | |||
| WO9931140, |
| Executed on | Assignor | Assignee | Conveyance | Frame | Reel | Doc |
| Jan 12 2012 | Immunogen Inc. | (assignment on the face of the patent) | / |
| Date | Maintenance Fee Events |
| Jun 04 2019 | M1553: Payment of Maintenance Fee, 12th Year, Large Entity. |
| Date | Maintenance Schedule |
| Jan 01 2016 | 4 years fee payment window open |
| Jul 01 2016 | 6 months grace period start (w surcharge) |
| Jan 01 2017 | patent expiry (for year 4) |
| Jan 01 2019 | 2 years to revive unintentionally abandoned end. (for year 4) |
| Jan 01 2020 | 8 years fee payment window open |
| Jul 01 2020 | 6 months grace period start (w surcharge) |
| Jan 01 2021 | patent expiry (for year 8) |
| Jan 01 2023 | 2 years to revive unintentionally abandoned end. (for year 8) |
| Jan 01 2024 | 12 years fee payment window open |
| Jul 01 2024 | 6 months grace period start (w surcharge) |
| Jan 01 2025 | patent expiry (for year 12) |
| Jan 01 2027 | 2 years to revive unintentionally abandoned end. (for year 12) |