FAP and cholangiocarcinoma: Moderate-strong FAP expression in the tumor stroma was present in 93.1% (54/58) of CCA (Figures 1–3), 60.7% (17/28) of metastatic HCC (Supplementary Figure S1), 29.6% (42/142) of primary HCC (Supplementary Figure S2), 21.1% (4/19) of FNH (Supplementary Figure S3) and 11.6% (3/26) of HCA (Supplementary Figure S4).