MTOR and posterior cortical atrophy: Briefly, this study aimed to evaluate the potential of reciprocal miR-99b-5p/mTOR (down/up) as a novel diagnostic/prognostic biomarker, and to explore the plausible functional roles of miR-99b-5p in regulating cellular mTOR dynamics and the mTOR-mediating downstream signaling in PCa aggressiveness/progression.