Concomitant targeting of PI3K/mTOR with either HER2 or mGluR1 inhibitors results in decreased cell survival and tumor growth in xenograft studies. Our results suggest a novel therapeutic possibility for PTEN wild-type-PI3K/AKT mutant prostate cancer patients based in the combination of PI3K/mTOR blockade with HER2 or mGluR1 inhibitors.