IDO1 and neoplasm: Immunohistochemical analysis of tissue arrays derived from HumanProteinAtlas (https://www.proteinatlas.org) indicated that more than half of the cervical cancer patients (7/12) expressed medium or high levels of IDO1 in tumor cells (Fig. 7G), whereas IDO1 protein expression levels were generally higher in cervical cancer tissues compared to those of the normal cervix tissues (Fig. 7H).