NICE has withdrawn this guidance. Novartis will stop marketing crizanlizumab (Adakveo) because its marketing authorisation has been withdrawn by the Medicines and Healthcare products Regulatory Agency (MHRA). Novartis has issued a direct letter to healthcare professionals specialising in haematology. No new people will start taking crizanlizumab in the UK. Healthcare professionals should discuss alternative treatment options with people currently having crizanlizumab.