[Fundamental and clinical study of chemotherapy of refractory choriocarcinoma].

Since the introduction of MAC therapy in 1973, choriocarcinoma has become one of the most curable gynecologic malignancies. But in MAC resistant cases, the therapeutic results have been unsatisfactory. To establish the proper therapy for MAC resistant choriocarcinoma, fundamental experiments with MTX resistant HM cell lines were carried out with the aim of their clinical application. The effective combination in the treatment of choriocarcinoma appeared to be 10 to the minus 5th power mol of MTX and 10 to the minus 8th power mol of Act-D, considering its effect in cell proliferation inhibition, deoxyuridine uptake inhibition and dihydrofolate reductase activity suppression. Taking the effects of Oncovin confirmed by the experiments with nude mice into consideration, a combined moderate dose of MTX, Oncovin and Act-D, namely MOA therapy was used. The protocol of MOA therapy is as follows: The first day, MTX 150mg bolus, 300mg drip infusion for 4 hours, Oncovin 2mg bolus and Act-D 0.5mg bolus. From the second to the fifth day, Act-D bolus. MAC was effective in only one of the eight recurrent cases, but on the other hand, MOA was effective in five cases of choriocarcinoma including two MAC resistant cases. Therefore, MOA seemed to be a more effective therapy than MAC.