Prognostic Value of Skeletal Muscle Loss in Patients with Hepatocellular Carcinoma Treated with Hepatic Arterial Infusion Chemotherapy

SIMPLE SUMMARY: Although reduced skeletal muscle mass affects therapeutic efficacy and adverse events in various therapies for hepatocellular carcinoma (HCC), there are no reports on skeletal muscle mass or its changes and prognostic indications in patients with advanced HCC undergoing hepatic arterial infusion chemotherapy (HAIC). This is the first study to show the association between the presence of a decreased skeletal muscle index (SMI) and clinical outcomes in HAIC, with novel evidence having a strong impact. A decrease in the SMI immediately after the start of HAIC was significantly associated with poor progression-free survival and overall survival in patients with advanced HCC, whereas the pre-treatment SMI was not a significant factor. Additionally, patients with a decreased SMI after treatment had worse nutritional status and liver function and poor therapeutic effects. It is effective to monitor the SMI and evaluate the therapeutic effects by using computed tomography to evaluate general conditions and predict clinical outcomes. ABSTRACT: Sarcopenia-related factors, including the skeletal muscle index (SMI), are reportedly associated with prognosis in patients with hepatocellular carcinoma (HCC) receiving various treatments. However, there is no evidence relating to hepatic arterial infusion chemotherapy (HAIC). In this study, we investigated whether a low SMI was associated with worse clinical outcomes of HAIC. Seventy patients with advanced HCC were included. Clinical outcomes were compared between the decreased SMI (n = 27) and non-decreased SMI (n = 43) groups, which were classified according to changes in the SMI after 3 weeks of treatment. In the prognostic analysis, patients in the decreased SMI group had significantly shorter progression-free and overall survival (OS) than those in the non-decreased SMI group. In addition, poor nutritional status and liver function were associated with an immediate decrease in the SMI after HAIC. The therapeutic effect was worse in the decreased SMI group than in the non-decreased SMI group, although the incidence of adverse events did not significantly differ. In multivariate analysis, a decreased SMI at 3 weeks after HAIC was identified as a significant independent factor associated with OS. A decreased SMI in patients with advanced HCC undergoing HAIC was associated with poor prognosis. It is effective to monitor the SMI to evaluate general conditions and predict clinical outcomes.