Experimental chemotherapy and radiotherapy for metastatic mouse bladder cancer

点击翻译按钮获取中文摘要

Combination chemotherapies such as M-VAC (Methotrexate, Doxorubicin, Vinblastine, Cis-platin) were administered to the patients with advanced urothelial cancer. On the outcome of M-VAC regimen, overall response rate of approximately 60% was high, but short duration of response and low response rate in the bone of less than 20% were remained to be studied. To solve these problems we studied on (1) In in vitro experiment using MTT assay, whether effectiveness of anticancer agents is promising or not, (2) In in vivo experiment using C3H/He mice, how to manage the regimen in the combination chemotherapy. All of 4 drugs containing in the M-VAC regimen had a significant anti-tumor activity. On the in vivo experiment, we confirmed the tumor formation in the lung which were induced by injecting the MBT-2 tumor cells into the tail vain of C3H/He mice. Growth inhibition rate of the tumors was higher in the group treated with M-VAC at 2 days after the injection of MBT-2, but not in the group at 7 days after that. Does escalation including double does of M-VAC did not improved the growth inhibition rate. These results may indicate that to improve the duration of response anti-cancer regimen should be started at the period of micro-metastasis of the tumor. Bone metastasis in MBT-2 injected C3H/He mice was occured by clumping of inferior vena cava, and the same regimen in the combination chemotherapy was performed. There was no response in the bone tumor, even by double does of M-VAC.This result coincided with the clinical one and might indicate that does escalation of M-VAC regimen might induce a further toxicity.