Link between type 2 diabetes mellitus and hepatocellular carcinoma

Type 2 diabetes mellitus (T2DM) and hepatocellular carcinoma (HCC) have a strong bidirectional relationship. T2DM increases the risk of developing HCC, mainly through the nonalcoholic steatohepatitis pathway, but a significant proportion of patients develop HCC without developing cirrhosis. The identification of HCC in T2DM patients is difficult considering the low incidence of HCC and the high prevalence of T2DM. However, considering the alarming increase in the incidence of diabetes mellitus in the global population, effective strategies are urgently needed to identify patients at high risk. Nonetheless, various classes of drugs, such as sodium-glucose cotransporter-2 inhibitors and incretin analogs, may be promising for reducing the risk of nonalcoholic steatohepatitis and HCC development in T2DM patients in the future. In this review, we discuss all these facets of the relationship between HCC and T2DM, and we summarize future directions.