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Comparison of survival curves between chemotherapy group and group without chemotherapy. (A) Comparison of OS in patients ≤ 80 years old; (B) Comparison of LCSS in patients ≤ 80 years old; (C) Comparison of OS in patients >80 years old; (D) Comparison of LCSS in patients > 80 years old. Abbreviations: OS: Overall survival; LCSS: Lung cancer-specific survival; Cum: Cumulative.
