Simotaxel

**Semantic type:** Pharmacologic Substance

**Definition:** A semi-synthetic, orally bioavailable, third-generation taxane derivative and microtubule-stabilizing agent, with potential antineoplastic activity. Upon administration, simotaxel binds to tubulin, promotes microtubule assembly and stabilization, and prevents microtubule depolymerization. This results in G2/M arrest, apoptosis and the inhibition of cell proliferation in susceptible tumor cells. This agent is a poor substrate for P-glycoprotein-related drug resistance mechanisms; therefore, it may be useful for treating multi-drug resistant tumors. MST-997 is more potent than paclitaxel and docetaxel and overcomes paclitaxel and docetaxel resistance in certain tumor cell types.

**Synonyms:** - 5Beta,20-epoxy-1,2alpa,4,7beta,10beta,13alpha-hexahydroxytax-11-en-9-one-4-acetate 2-benzoate Ester with (2R,3S)-N-Isopropoxycarbonyl-3-(2-thienyl) Isoserine - MST-997 - SIMOTAXEL - TL-909 - Taxane-997