KRT19 and hepatocellular carcinoma: In immunohistochemistry test, compared to non‐sarcomatoid HCC, sarcomatoid HCC showed comparable rates of positive conventional HCC markers (hepatocytes, glypican‐3, and α‐fetoprotein), higher rates of positive cholangiocyte markers (CK7 and CK19), and specific expression of mesenchymal/epithelial markers (vimentin and CK) (Figure 3A).