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PFS, progression-free survival; HR, hazard ratio; CI, confidence interval; CLM, colorectal-cancer liver metastases; group 1, number of liver metastases ≤ 2; group 2, number of liver metastases > 2 and ≤ 8; CEA, serum carcinoembryonic antigen; LVI, lymphovascular invasion.
*P < 0.05.
