Background: Adjuvant chemotherapy for resectable colorectal liver metastasis (CRLM) is widely used, but its efficacy lacks clear evidence. This retrospective cohort study investigated the effectiveness of neoadjuvant chemotherapy (NAC) compared to upfront surgery for CRLM.
Methods: Data from patients with resectable CRLM were analyzed. Short-term outcomes and long-term prognosis were analyzed using propensity score matching. CRLM was stratified according to the H-classification (H1 and H2), and the effectiveness of adjuvant chemotherapy was analyzed in each group.
Results: We analyzed 599 cases that were matched into an NAC group (n = 136) and an upfront surgery group (n = 136). The proportion of synchronous metastases, H2-classification, and postoperative chemotherapy rate did not differ between the groups. Overall survival (OS) after initial treatment was significantly worse in the NAC group than in the upfront surgery group (P = 0.029). The 5-, 7-, and 10-year OS rates for H1 patients were significantly better in the upfront surgery group than in the NAC group (64%, 51%, and 44% vs. 50%, 31%, and 18%, respectively) (P = 0.004).
Conclusion: Patients with resectable CRLM should undergo upfront surgery, because NAC did not improve OS after initial treatment in these patients.
Keywords: Colorectal cancer; Hepatectomy; Liver; Metastasis; Neoadjuvant chemotherapy.
© 2021. The Society for Surgery of the Alimentary Tract.