Keytruda 是处方药，香港网友怎么买到？难道是医生之间从医院转过去？ Keytruda US price 4 vials $8760. Keytruda is used to treat Non Small Cell Lung Cancer (has to test if the patient is PD-L1 positve) and Malignant Melanoma. 魏得的是Leimyosarcoma, smooth muscle sarcoma. If they treat him using the same dose and schedule as treating melanoma. 2 mg/kg IV infusion over 30 minutes every 3 weeks. Suppose he's 50kg, that's 100mg per cycle. According to US price, that's $2175 per vial for one cycle every 3 weeks. Not including hospital or doctor fees. Keytruda may not actually increase the overall survival years. Keytruda probably needs to be used with conventional chemotherapy, like methotrexate, cisplatin, cyclophosphamide, which cause a hell lot of side effects. Clinical trials haven't found Keytruda worked with Leiomyosarcoma. So he may not survive with Keytruda anyway.