This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Gynaecological Disorders in Obs., Subject name: Gynaecology & Obstetrics
All are indications for post-operative radiotherapy in a case of Carcinoma Endometrium EXCEPT? 
Select and explain. 
A. Myometrial invasion >1/2 thickness, B. Positive lymph nodes, C. Endocervical involvement, D. Tumor positive for estrogen receptors
D: Tumor positive for estrogen receptors
Answer: D: Tumor positive for estrogen receptors 
Explanation: Ans. D. Tumor positive for estrogen receptorsa. Receptor positivity have no influence on postop radiotherapy.b. As far as receptor status is concerned, the best correlation is that of a good prognosis with high progesterone receptors rather than a poor prognosis with high estrogen receptorsc. The best prognostic factor of cancer endometrium, amongst others, is the Histological grading of the diseased. Other important predictors are:i. Depth of myometrial invasionii. Status of pelvic and para-aortic lymph nodesiii. Malignant cells in peritoneal washingsiv. Lymph vascular invasionv. Cervical invasion