borderline significantP = 0.052
On the contrary, it may reduced the 1-,2-,3-year LFFS rate or DMFS rate .This results compared with a study reported by liang [ 19 ] at 2014 has some inconsistencies .He reported that concurrent chemoradiotherapy plus adjuvant chemotherapy didn't significantly improve the 2-year OS,LFFS,DMFS, but he found a borderline significant difference in os by CCRT+AC treatment in patients with N2-3 disease( P = 0.052).Analyzed its cause, the main possibility is we enlarged the number of participants.