GSK Plc has received US approval for Ojjaara (momelotinib), a Janus kinase inhibitor for the treatment of myelofibrosis patients with anaemia. The authorisation is based on positive results from two Phase 3 trials both of which were designed to show a reduction in manifestations of the disease. Myelofibrosis is a rare blood cancer that can lead to severely low blood counts, including anaemia and thrombocytopaenia.