This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Gynaecology & Obstetrics
Indication of adjuvant radiotherapy in Ca endometrium is/are:a) Cervical involvementb)  Lymph node involvement c) Carcinoma in situd) Papillary serous tumore) Estrogen receptor positive 
Select and explain. 
A. abc, B. bc, C. acd, D. bcd
A: abc
Answer: A: abc 
Explanation: Indications of adjuvant radiotherapy:

Extrauterine extension.
Lower uterine or cervical involvement.
Papillary serous or clear cell histology.
Poor histologic differentiation (Grade Ill).
Myometrial penetration greater than 1/2 of thickening.
Pelvic node involvement.

Tumor positive for estrogen receptors suggest well differentiated disease, So no adjuvant radiotherapy is recommended