The ideal timing of radiotherapy for Willm's tumor after surgery is -: (A) Within 10 days, (B) Within 2 weeks, (C) Within 2 months, (D) Any time after surgery
Answer is A. The postoperative radiotherapy in Wilm's tumor is started within 10 days of surgery.
Delay in starting radiotherapy beyond ten days leads to tumor cells repopulation and increases the relapse rate.