The ideal timing of radiotherapy for Wilms tumour after surgery is –: (A) Within 10 days, (B) Within 2 weeks, (C) Within 3 weeks, (D) Any time after surgery
Answer is A. The postoperative radiotherapy in Willm's tumor is started within 10 days of surgery. Delay in starting RT beyond 10 days leads to tumor cell repopulation and increase in relapse rate.