New research from Anstee and colleagues has confirmed that a common nonsynonymous single nucleotide polymorphism in TM6SF2 (rs58542926 c.449 C>T, Glu167Lys) is associated with NAFLD and causally related to a signal assigned to NCAN on chromomose 19 by a genome-wide association study. By looking at two cohorts that included histologically characterized steatosis, steatohepatitis, fibrosis and cirrhosis, they have also established a new association between the TM6SF2 polymorphism and hepatic fibrogenesis.