KRT19 and hepatocellular carcinoma: Downregulation of thyroid hormone receptor (TR) β1 and, to a lesser extent, TRα1 was observed only in the preneoplastic lesions positive for the progenitor cell marker, cytokeratin‐19 (Krt‐19), and HCC of the resistant‐hepatocyte rat model, suggesting that a hypothyroid status favors the onset and progression of preneoplastic lesions to HCC.