LAUSR

Purpose To explore whether body composition and/or sarcopenia are associated with liver hypertrophy following portal vein embolization (PVE) in patients with colorectal liver metastases (CLM). Methods Patients with CLM who underwent right PVE prior to a planned right hepatectomy were identified from the institutional liver database from 2004 to 2014. Patients were excluded due to previous liver-directed therapy/hepatectomy, right PVE + segment IV embolization, or planned 2-stage hepatectomy. Advanced imaging software was used to measure body compartment volumes (cm 2 ), which were standardized to height (m 2 ) to create an index: skeletal muscle index (SMI), subcutaneous adipose index (SAI), and visceral adipose index (VAI). SMI, gender, and body mass index (BMI) were used to define sarcopenia. The main outcome of interest was hypertrophy of the future liver remnant (FLR) following PVE, which was reported as degree of hypertrophy (DH) and kinetic growth rate (KGR). Results Patients were evenly divided into three KGR groups: lower third (KGR:0.7–2.0%), middle third (KGR:2.0–4.1%), and upper third (KGR:4.2–12.3%). Patients in the lower third KGR group had a lower VAI (31.0 vs 53.0 vs 54.5 cm 2 /m 2 , p  = 0.042) and were more commonly sarcopenic (60%) compared to the upper third (20%, p  = 0.025). Eighteen patients (40%) met criteria for sarcopenia. Sarcopenic patients had a lower VAI (29.1 vs 57.4 cm 2 /m 2 , p  = 0.004), lesser degree of hypertrophy (8.3% vs 15.2%, p  = 0.009), and lower KGR (2.0% vs 4.0%, p  = 0.012). Conclusion Sarcopenia and associated body composition indices are strongly associated with clinically relevant impaired liver regeneration, which may result in increased liver-specific complications following hepatectomy for CLM.