Gynaecology & Obstetrics Risk factors for malignant transformation of endometrial polyp are all except A Large polyp > 1.5 cm size B Abnormal uterine bleeding C Use of tamoxifen D Use of oral contraceptive. 💡 Explanation Risk factors for malignant transformation of endometrial polyp are all except ✓ Correct Answer: D. Use of oral contraceptive.