A substantial study of 375 patients investigated the prognostic significance of mTOR pathway components in tumors obtained at nephrectomy, and observed adverse prognostic impact on disease-specific survival of pS6K, PTEN and Akt independent of stage.73 A small study further suggested that pS6K and possibly Akt were predictors of response to temsirolimus for advanced RCC.67,74 However an extension of the study20 of temsirolimus for poor prognosis advanced RCC did not find a correlation between PTEN and HIF-1?
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