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The activation of mammalian target of rapamycin (mTOR) signaling pathway in endometrial carcinoma cells Ishikawa and HEC-1A was investigated. The expression of mTOR was detected by confocal fluorescence microscopy in Ishikawa and HEC-1A cells. The mRNA levels of PTEN and mTOR, the downstream substrate S6K1 and 4E-BP1 protein were assayed by RT-PCR and Western blot, respectively. The expression of PTEN in Ishikawa cells was deficient, but intact in HEC-IA cells respectively (P