Is neoadjuvant chemotherapy appropriate for patients with resectable liver metastases from colorectal cancer?

PurposeNeoadjuvant chemotherapy (NAC) for resectable liver metastasis from colorectal cancer (CRLM) is used widely, but its efficacy lacks clear evidence. This study aimed to clarify its worth and develop appropriate treatment strategies for CRLM.MethodsWe analyzed, retrospectively, the clinicopathological factors and outcomes of 137 patients treated for resectable CRLM between 2006 and 2015, with upfront surgery (NAC(-) group; n=117) or initial NAC treatment (NAC(+) group; n=20).ResultsThe time to surgical failure (TSF) and overall survival (OS) after initial treatment were significantly worse in the NAC(+) group than in the NAC(-) group (P=0.002 and P=0.032, respectively). At hepatectomy, the NAC(+) group had a lower median prognostic nutrition index (PNI), higher rates of a positive Glasgow Prognostic Score (P=0.002) and more perioperative blood transfusions (P=0.027) than the NAC(-) group. Moreover, the serum albumin (P=0.006), PNI (P0.001) and lymphocyte-to-monocyte ratio (P0.001) were significantly decreased and the GPS positive rate was increased from 15 to 35% in the NAC(+) group. The OS rates did not differ significantly according to the NAC response (5-year OS ratesCR/PR 67%, SD 60%, PD 38%).ConclusionsPatients with resectable CRLM should undergo upfront hepatectomy because NAC did not improve OS after initial treatment in these patients.