CD8A and cholangiocarcinoma: Supplementary Table S1 contains a detailed description of CD4+ Treg and CD8+ Treg levels (in percentage and absolute counts) in the peripheral blood of HG, CCA, and HCC (both at T0 and T1), and patients’ subgroups (grouped according to the TNM stage, histologic grade, negativity/positivity for the hepatitis C virus, absence/presence of cirrhosis and microvascular invasion, and aggressiveness degree of the tumor).