Abstract

The abilities of misonidazole, Ro 05-9963, Ro 03-8799 and Sr-2508 to enhance the action of the drugs cyclophosphamide (CY) and melphalan (L-PAM) have been compared in two mouse fibrosarcomas at acute and chronic sensitizer doses. SR-2508 was not effective with either CY or L-PAM in either tumor. Some enhancement of CY was obtained with Ro 05-9963 and Ro 03-8799; however, the degree of enhancement varied according to tumor and acute or chronic sensitizer dose. In all cases, the degree of enhancement was less than that obtained with an equivalent dose of misonidazole in both tumor systems. Of the four compounds tested, MISO would appear to have the most potential as a chemosensitizer.

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