Clinical studies with epothilones for the treatment of metastatic breast cancer

Seminars in Oncology
Linda Vahdat

Abstract

Standard cytotoxic chemotherapy of locally advanced or metastatic breast cancer includes the microtubule-stabilizing taxanes, but like other cytotoxic drugs their effectiveness is compromised by resistance that is either inherent or develops during treatment. Epothilones, which also stabilize microtubules but by a different mechanism, are in clinical development primarily to overcome taxane or multidrug resistance, based on potent preclinical antitumor activity against resistant tumor lines. Ixabepilone is the best-studied epothilone clinically and is active in patients with metastatic breast cancer that has been pretreated with, or had established resistance to, taxanes and/or anthracyclines. In a phase III trial in patients with anthracycline-pretreated or -resistant and taxane-resistant locally advanced or metastatic breast cancer, adding ixabepilone to capecitabine significantly improved progression-free survival and the overall response rate compared with capecitabine alone. The primary toxicities associated with ixabepilone treatment are neuropathy and neutropenia, but both are generally manageable. Other epothilones currently in clinical studies are KOS-862, patupilone, ZK-EPO, BMS-310705, and KOS-1584, which have all sh...Continue Reading

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Sep 16, 2009·Journal of Experimental & Clinical Cancer Research : CR·Ralf Hass, Catharina Bertram
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