Medicament for treating and/or preventing cancer

1. A method for treating and/or preventing recurrence of a CAPRIN-1 expressing cancer, comprising:

administering a medicament to a subject suspected of having a cancer,

wherein the medicament comprises a combination of an antibody or a fragment thereof having immunological reactivity with a CAPRIN-1 protein, and one or two or more types of antitumor agents,

wherein the antibody or fragment and the antitumor agent or antitumor agents are combined together or separately,

wherein the antibody or fragment and the antitumor agent are not conjugated together,

wherein the cancer expresses the CAPRIN-1 protein on the cell surface of the cancer and the antibody or fragment binds specifically to the extracellular region of a CAPRIN-1 protein existing on the surface of a cancer cell.

2. The method according to claim 1 , wherein the antibody or a fragment thereof having immunological reactivity with a CAPRIN-1 protein is an antibody or a fragment thereof which binds specifically to a polypeptide consisting of the amino acid sequence of SEQ ID NO: 37 in the extracellular region of the CAPRIN-1 protein existing on the surface of a cancer cell.

3. The method according to claim 1 , wherein the CAPRIN-1 protein is from a human.

4. The method according to claim 1 , wherein the above antitumor agent is selected from one or more of the group consisting of: paclitaxel, doxorubicin, daunorubicin, cyclophosphamide, methotrexate, 5-fluorouracil, thiotepa, busulfan, improsulfan, piposulfan, benzodopa, carboquone, meturedopa, uredopa, altretamine, triethylenemelamine, triethylenephosphoramide, triethilenethiophosphoramide, trimethylolomelamine, bullatacin, bullatacinone, camptothecin, bryostatin, callystatin, cryptophycinl, cryptophycin8, dolastatin, duocarmycin, eleutherobin, pancratistatin, sarcodictyin, spongistatin, chlorambucil, chlornaphazine, cholophosphamide, estramustine, ifosfamide, mechlorethamine, mechlorethamine oxide hydrochloride, melphalan, novembichin, phenesterine, prednimustine, trofosfamide, uracil mustard, carmustine, chlorozotocin, fotemustine, lomustine, nimustine, ranimustine, calicheamicin, dynemicin, clodronate, esperamicin, aclacinomycin, actinomycin, authramycin, azaserine, bleomycin, cactinomycin, carabicin, carminomycin, carzinophilin, chromomycin, dactinomycin, detorbicin, 6-diazo-5-oxo-L-norleucine, adriamycin, epirubicin, esorubicin, idarubicin, marcellomycin, mitomycin C, mycophenolic acid, nogalamycin, olivomycins, peplomycin, potfiromycin, puromycin, quelamycin, rodorubicin, streptonigrin, streptozocin, tubercidin, ubenimex, zinostatin, zorubicin, denopterin, pteropterin, trimetrexate, fludarabine, 6-mercaptopurine, thiamiprine, thioguanine, ancitabine, azacitidine, 6-azauridine (azauridine), carmofur, cytarabine, dideoxyuridine, doxifluridine, enocitabine, floxuridine, calusterone, dromostanolone propionate, epitiostanol, mepitiostane, testolactone, aminoglutethimide, mitotane, trilostane, frolinic acid, aceglatone, aldophosphamideglycoside, aminolaevulinic acid, eniluracil, amsacrine, bestrabucil, bisantrene, edatraxate, defofamine, demecolcine, diaziquone, elfornithine, elliptinium acetate (elliptinium), epothilone, etoglucid, lenthinan, lonidamine, maytansine, ansamitocine, mitoguazone, mitoxantrone, mopidanmol, nitraerine, pentostatin, phenamet, pirarubicin, losoxantrone, podophyllinic acid, 2-ethyl hydrazide, procarbazine, razoxane, rhizoxin, schizophyllan, spirogermanium, tenuazonic acid, triaziquone, roridine A, anguidine, urethane, vindesine, dacarbazine, mannomustine, mitobronitol, mitolactol, pipobroman, gacytosine, docetaxel, chlorambucil, gemcitabine, 6-thioguanine, mercaptopurine, cisplatin, oxaliplatin, carboplatin, vinblastine, etoposide, ifosfamide, mitoxanthrone, vincristine, vinorelbine, novantrone, teniposide, edatrexate, daunomycin, aminopterin, xeloda, ibandronate, irinotecan, topoisomerase inhibitor, difluoromethylolnitine (DMFO), retinoic acid, capecitabine, and pharmaceutically acceptable salts and derivatives thereof.

5. The method according to claim 1 , wherein the antitumor agent is selected from the group consisting of cyclophosphamide, paclitaxel, docetaxel, vinorelbine, and pharmaceutically acceptable salts and derivatives thereof.

6. The method according to claim 1 , wherein the antibody is selected from the group consisting of single chain antibodies (scFv), Fab, F(ab′) 2 , and Fv.

7. The method according to claim 1 , wherein the antibody is a human antibody, humanized antibody, chimeric antibody, single chain antibody, or bispecific antibody.

8. The method according to claim 1 , wherein the above antitumor agent is one or more androgens.

9. A method for treating and/or preventing recurrence of a CAPRIN-1 expressing cancer, comprising

administering a medicament to a subject suspected of having a cancer,

wherein the medicament comprises a combination of an antibody or a fragment thereof having immunological reactivity with a CAPRIN-1 protein, and one or two or more types of antitumor agents,

wherein the antibody or fragment and the antitumor agent or antitumor agents are combined together or separately,

wherein the antibody or fragment and the antitumor agent are not conjugated together,

wherein the cancer expresses the CAPRIN-1 protein on the cell surface of the cancer, and

wherein the antibody or a fragment thereof having immunological reactivity with a CAPRIN-1 protein is an antibody or a fragment thereof which binds specifically to a polypeptide consisting of the amino acid sequence of SEQ ID NO: 37 in the extracellular region of the CAPRIN-1 protein existing on the surface of a cancer cell.