Correlations among the relative expression levels of indoleamine 2,3‐dioxygenase 1 in T cells (T‐IDO1) with CD8, albumin‐bilirubin (ALBI) grade, platelet level, α‐fetoprotein level (AFP), hepatitis B virus (HBV) positivity, and IDO1 expression in inflammatory cells (I‐IDO1). A, Tumors were classified as CD8‐low (n = 52) or CD8‐high (n = 60) and analyzed for the proportion of T‐IDO1. B, Patients were classified as ALBI grade 1 (n = 86) or ALBI grade 2 (n = 26) and analyzed for the proportion of T‐IDO1. C, Patients were classified as platelets low (n = 13) or platelets normal (n = 99) and analyzed for the proportion of T‐IDO1. D, Patients were classified as AFP− (n = 36) or AFP+ (n = 76) and analyzed for the proportion of T‐IDO1. E, Patients were classified as HBV− (n = 10) or HBV+ (n = 102) and analyzed for the proportion of T‐IDO1. C, Tumors were classified as I‐IDO1 low (n = 47) or I‐IDO1 high (n = 58) and analyzed for the proportion of T‐IDO1. HPF, high‐power field