68. Paclitaxel and the other taxanes have a central role in the therapy of ovarian, breast, lung, GI, genitourinary, and head and neck cancers. The cytotoxic effect of the taxanes in tumor cells is the result of (A)inhibition of microtubule formation. (B)inhibition of microtubule disassembly. (C)enhancement of microtubule disassembly. (D)inhibition of topoisomerase I.