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Kaplan-Meier survival analysis for disease-free survival after hepatectomy or radiofrequency ablation for colorectal liver metastasis according to tumor number and size. A: Single CRLM; B: Multiple CRLM; C: Size of CRLM (≤ 2 cm); D: Size of CRLM (2 cm < CRLM ≤ 3 cm); E: Single and size of CRLM (≤ 2 cm); F: Multiple or size of CRLM (2 cm < CRLM ≤ 3 cm). RFA: Radiofrequency ablation; CRLM: Colorectal liver metastasis.
