Fig. 3.

Kaplan–Meier analysis of different radiotherapy sequences on OS and LCSS of IIIA/N2 NSCLC patients. It showed that both in OS and LCSS of IIIA/N2 NSCLC patients, preoperative radiotherapy was the best strategy, and then were both preoperative and PORT, PORT, only surgery and neither surgery nor radiotherapy. Log Rank p < 0.001. The number of patients at risk in different time periods was under survival curves. Abbreviations: NSCLC, non–small cell lung cancer; IIIA/N2, stage IIIA pathologic N2; OS, Overall survival; LCSS, Lung cancer specific survival