The primary aim of the trial is to investigate the late effects of hypofractionated external radiation (39 Gy in 13 fractions) in patients requiring post-operative radiation for early-stage cervical and endometrial cancers.

This is a phase II prospective study that will be accruing patients with post operative cervical or endometrial cancer requiring adjuvant pelvic radiation.

External beam radiotherapy (Intensity modulated radiotherapy/arc technique) will be delivered to pelvis to a dose of 39 Gray (Gy) in 13 fractions at 3 Gy per fraction, delivered once daily over 2.5 - 3 weeks. Treatment will be delivered with Intensity Modulated Radiotherapy (IMRT) under image guidance. Patients for whom concurrent chemotherapy is indicated (as per adverse risk features) will receive concurrent weekly cisplatin (40mg/m2) based on standard institutional protocol. All patients with post-operative cervical cancer will receive vaginal brachytherapy after the completion of external beam radiation. Patients with endometrial cancer with certain pre defined risk factors will also receive vaginal brachytherapy. The dose of vaginal brachytherapy will be 6 Gy high dose rate brachytherapy delivered as two different fractions, one week apart. Patients will be evaluated by the concerned investigators on a weekly basis during radiation therapy and all the toxicities will be documented according to the CTCAE V 5.0.

Patients will be followed up 3 monthly for the first 2 years, then 6 monthly from years 2 - 5, and annually thereafter. CTCAE version 5 will be used for toxicity grading at each follow-up. Quality of life assessment will be performed at baseline prior to the start of radiation and on follow-up at pre-specified times using the European Organization for Research and Treatment of Cancer Quality of Life Questionnaire (QLQ-C30) and Cervix - 24 (CX24) for cervical cancer patients and Endometrium 24 (EN24) for endometrial cancer patients.

Inclusion Criteria:

1. Eastern Cooperative Oncology Group (ECOG) performance status of 0 to 2
2. Histologically confirmed diagnosis of cervical cancer post hysterectomy with intermediate or high-risk features, requiring adjuvant EBRT ± concurrent chemotherapy OR histologically confirmed diagnosis of endometrial cancer post hysterectomy requiring adjuvant (chemo)radiotherapy to pelvis with/without vaginal brachytherapy.

Exclusion Criteria:

1. Patients with macroscopic residual disease (R+ resection) postoperatively
2. Patients requiring extended field radiotherapy (patients with involved para-aortic lymph nodes in cervical or endometrial cancer)
3. Patients treated with chemotherapy for any prior malignancy at any time
4. Patients treated with pelvic radiation previously
5. Patients with human immunodeficiency virus infection
6. Any preexisting medical conditions that may interfere with the assessment of genitourinary or gastrointestinal toxicity (This includes patients with irritable bowel syndrome, subacute intestinal obstruction, anal incontinence, hemorrhoids precluding analysis of gastro-intestinal toxicities, urinary incontinence, recurrent urinary tract infections)