We detected high expression levels of IDO1 and COX2 in 72/107 (67.3%) and 69/107 (64.5%) primary CRC specimens, and low levels of IDO1 and COX2 in 35/107 (32.7%) and 38/107 (35.5%), respectively (Figure 1). Here, IDO1 is linked to colorectal carcinoma.