Summary
A case-controlled collaborative study on the intravesical administration of Adriamycin in the presence or absence of verapamil, a calcium-channel blocker, as chemotherapy of superficial bladder cancer was carried out at two universities, Okayama and Kagoshima, and their affiliated hospitals. Although little is known about the expression of P-glycoprotein in superficial bladder cancer, it may be a cause of multidrug resistance (MDR). Verapamil was used as an inhibitor of P-glycoprotein. Arm A consisted of Adriamycin given at 50 mg/50 ml saline, and arm B constituted Adriamycin given at 50 mg/40 ml saline plus 5 ampules (10 ml) of injectable verapamil. The drugs were instilled into the bladder for 3 consecutive days in each of 3 consecutive weeks for a total of 9 instillations. No significant difference in antitumor effects was observed between arm A and arm B. Recurrent tumors responded better than did primary tumors to both arm-A and arm-B treatments (P=0.012). In both treatment arms, significant differences (P=0.031) in the response rate were found between tumors with, diameters of <1 cm and those measuring 1–3 cm in diameter. Although the number of evaluable patients was limited, recurrent subjects who had previously received Adriamycin instillations responded in both treatment arms.
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Ohi, Y., Ohmori, H., Shirahama, T. et al. Intravesical instillation of Adriamycin in the presence or absence of verapamil for the treatment of superficial bladder cancer: preliminary report of a collaborative study. Cancer Chemother. Pharmacol. 30 (Suppl 1), S50–S54 (1992). https://doi.org/10.1007/BF00686942
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DOI: https://doi.org/10.1007/BF00686942