... cells (labeling frequency percentage). The intensity ofmembrane staining was grouped into the following 4 cat-egories: no staining/background of negative controls(score = 0), weak staining detectable ... MedicineOpen AccessResearchThe paradoxical patterns of expression of indoleamine 2,3-dioxygenase in colon cancerYan-Fang Gao†1,2,3, Rui-Qing Peng†1,2, Jiang Li1,2, Ya Ding1,2, Xing ... 1Expression of IDO and Bin1 in colon cancer. IDO is expressed in primary colon cancer cells (A), in adjacent non-cancer-ous epithelium (B) in lymph node metastases (C), and in tumor-draining lymph nodes...