Surgery Which of the following is the Post – Chemotherapy based staging system used in Wilm’s tumor? A National Wilm's Tumor Staging System (NWTSG) B International Society of Pediatric Oncology (SIOP) C AJCC TNM Staging D Chadwick Staging 💡 Explanation Which of the following is the Post - Chemotherapy based staging system used in Wilm's tumor? ✓ Correct Answer: B. International Society of Pediatric Oncology (SIOP)