Figure 3. Microenvironment of cholangiocarcinoma.
(A) Components of the tumor microenvironment in CCA. (B) Micrograph of a stromal CCA. (C) Factors secreted by cancer-associated fibroblasts. CCA, cholangiocarcinoma; CTGF, connective tissue growth factor; ECM, extracellular matrix; HGF, hepatocyte growth factor; MMP, matrix metalloproteinase; PDGF-β, platelet-derived growth factor beta; SDF-1, stromal cell-derived factor 1; TGF-β, transforming growth factor beta.