GSTM1 and hepatocellular carcinoma: A deletion of the GSTM1 gene—which encodes the glutathione S‐transferase mu 1 protein—was associated with HCC in two studies.11, 12 A relatively small total number of patients (n = 189) were included across these two studies, and the applicability to HCV is potentially questionable, given that only subsets of the patients in both studies were HCV‐infected, with the remaining patients having cirrhosis caused by other aetiologies.