The 1-year involved nodal failure rate was 20. 0% in ENI group and 10. 0% in IFI group( P -0. 048). The 1 -year elective node failure rate was 16.0% in ENI group versus 21.0% in IFI group(P-0. 39).

• 1年内累及野照射区内淋巴结复发率IFI组为10.；0%25；ENI组为20