Antitumor activity of cisplatin analogs against malignant ovarian tumor xenografts into nude mice.

The antitumor activity of new platinum analogs was studied at equitoxic doses to that of cisplatin (CDDP) in BALB/C nu-nu nude mice bearing xenografts of human ovarian malignant tumors. The following two tumor lines were used: OH-1 (serous cystadenocarcinoma) and MP-1 (mucinous cystadenoma, LPM). 1) Antitumor activity was determined for all agents from the T/C ratio for OH-1. In particular, 254-S and JM-8 were found to be much more active than the other agents. 2) Antitumor activity was determined with JM-8 from the abdominal diameter ratio for MP-1. Both JM-8 and CDDP yielded active responses which were evaluated by the CEA value. Therefore, JM-8 and CDDP were considered to be the most active agents for MP-1. 3) We evaluated the mean body weight loss of tumor bearing mice in order to study the side effects, and a great weight loss was observed with 254-S. 4) A large variety of effects were observed in the histological evaluation for the two tumor lines, and were thus difficult to discuss. Our findings suggest the necessity of individual chemotherapy for each histological type of ovarian malignant tumor.