Most interestingly, in PCa patients, IDO gene expression levels appeared to highly significantly correlate with those of IFN-γ (n = 48, r = 0.54; p < 0.001), and, to a lower extent, of TNF-α gene (n = 58, r = 0.37; p < 0.01) (Figure 5C). Here, IDO1 is linked to posterior cortical atrophy.