Postoperative Hypofractionated Intensity-modulated Radiation Therapy in Cervical Cancer

Inclusion Criteria: * histologically confirmed cervical cancer * radical hysterectomy and pelvic lymph node dissection was done * histologically indicated adjuvant radiotherapy ( more than one as below) 1. tumor size ≥4 cm 2. positive lymphovascular invasion 3. more than half stromal invasion depth * ECOG performance status 0 or 1 * Bone marrow function: granulocyte ≥1.0 x 1000/µl, platelet ≥30 x 1000/µl, hemoglobin ≥10 g/dl Exclusion Criteria: * positive pelvic lymph node metastasis * positive distant metastasis (including retroperitoneal lymph node metastasis) * positive tumor involvement on resection margin * positive parametrial invasion * previous history of pelvic radiotherapy * more than 3 months after radical surgery for cervical cancer * neoadjuvant chemotherapy was done * previous history of other carcinoma except for thyroid cancer, skin cancer, in situ carcinoma on cervix