IDO1 and uterine cervix neoplasm: In cervical cancer, IDO1 is involved in the self-renewal and expression of OCT4 and SOX2 in cervical cancer cells (Low et al., 2020), and the results of a study of a mouse model of cervical cancer suggested that inhibition of IDO1 expression reduces the size of cervical tumors and that the expression level of IDO1 is correlated with cervical cancer survival and prognosis (Low et al., 2020).