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Ression of HSP90 and the antitumor effect of an HSP90 inhibitor via inactivation of the Akt/mTOR pathway in undifferentiated pleomorphic sarcomaHirofumi Bekki1, Kenichi Kohashi1, Akira Maekawa1, Yuichi Yamada1, Hidetaka Yamamoto1, Katsumi Harimaya2, Michiyuki Hakozaki3, Kazuki Nabeshima4, Yukihide Iwamoto2 and Yoshinao Oda1*AbstractBackground: Undifferentiated pleomorphic sarcoma (UPS) is a hetero