Contingency table analysis did not provide any evidence for an association between IDO gene expression in tumor specimens and three classical clinicopathological parameters, PSA, pT, and Gleason score, while IL-6 gene expression was associated with PSA (p = 0.02) and showed a trend toward association with Gleason score (p = 0.06) (Table 5). Here, IDO1 is linked to neoplasm.