Letter: cytokeratin-18 as a biomarker of hepatocellular carcinoma regression after transarterial chemoembolization. - He, Z.‐H.; He, W.‐R.; Wu, L.‐L.; Zhao, C.; Peng, N.‐F.; Ahir, B.‐K.; Lu, C.‐Y. (Alimentary Pharmacology & Therapeutics, 2017)