Fourteen advanced BTCs patients from the single-arm phase II study (ChiCTR2000034283) receiving camrelizumab (anti-PD-1 antibody) plus apatinib (VEGFR2 inhibitor) as first-line combination therapy, were included for the current biomarkers analysis….Differential gene expression analysis revealed a significantly higher BRCA2, RAD51, BRIP1 expression (p < 0.001) and decreased TGFβ1, ITGAX, ITGB2 expression (p < 0.001) in responder tumors compared with non-responder tumors.