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BACKGROUND Indoleamine 2,3-dioxygenase (IDO1) is an enzyme that acts as an immunomodulatory molecule. It is found in several types of cancer where it seems to be associated with tumor escape due to its immunosuppressive mechanisms. However, the role of IDO1 expression in prostate cancer (PC) is unclear. The aim of our study was to evaluate the expression of IDO1 in localized PC and to correlate with the classic prognostic factor and recurrence after surgical treatment. METHODS We retrospectively evaluated surgical specimens from 111 pati