Several high risk factors for prophylactic chemotherapy for staph: 1. age > 40 years 2. hcg > 100,000 3. ovarian luteinized cyst volume > 6 cm 4. no follow up condition So, still agree with your doctor’s opinion. We recommend you to take chemotherapy. You need to monitor the hcg closely, at least once a week. Before chemotherapy, do a chest CT, after chemotherapy, after every two courses of chemotherapy, review the relevant auxiliary examinations: chest CT, ultrasound. If necessary, PET-CT is also needed.