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Overall survival with regard to clinical TNM stage in patients with non–small cell lung cancer. There was no significant difference in survival between stage IIA and stage IIIA (P = .202) and between stage IIB and stage IIIB (P = .885). Navy line, stage IA; purple line, stage IB; dark green line, stage IIA; dark orange line, stage IIB; blue line, stage IIIA; red line, stage IIIB; and black line, stage IV
