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Ridaforolimus (Deforolimus, MK-8669), a novel rapamycin analogue, is a novel, potent and selective inhibitor of mTOR with IC50 value of 0.2nM [1].

HT-1080 fibrosarcoma cells treated with ridaforolimus have been demonstrated to dose-dependently inhibit S6 and 4E-BP1 phosphorylation with IC50 values of 0.2 and 5.6 nM, respectively, and EC50 values of 0.2 and 1.0 nM, respectively. The antiproliferative activity of ridaforolimus has been observed in a broad panel of cell lines including the colon cancer cells HCT-116, leiomyosarcoma cells SK-UT-1, etc. Ridaforolimus has shown to block the production of VEGF production dose-dependently, with an EC50 value of 0.1nM [1].

In vivo, mice bearing MCF7 (breast), PC-3 (prostate), A549 (lung), HCT-116 (colon) or PANC-1 (pancreas) xenografts have revealed the antitumor efficacy of ridaforolimus [1].

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