A total of 72 patients with Grades IIa-IIIb cervical cancer were randomly divided into two groups , namely , the IMRT group for IMRT plan ( primary lesion , 45 Gy/22 ; the pelvic wall lymphatic drainage area , 50 Gy/22 ) , and the 3D CRT group ( conformal pelvic radiotherapy , 45 Gy/22 ; subsequent supplement of pelvic wall , 6.0 Gy/3 ) .