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Subgroup survival analysis of patients with metachronous lung metastases who underwent curative colorectal surgery. (A) Survival of patients who underwent pulmonary metastasectomy in 1990–1999 and 2000–2009. (B) Survival of patients who did not undergo pulmonary metastasectomy in 1990–1999 and 2000–2009. OS, overall survival. Bold lines indicate survival curves of cases in 2000–2009, and dotted lines those in 1990–1999.
