FDA accelerated approval of Vonjo for the treatment of adult patients with myelofibrosis and thrombocytopenia.

Vonjo is a novel oral kinase inhibitor with specificity for JAK2 and IRAK1, without inhibiting JAK1. The recommended dosage of Vonjo is 200 mg orally twice daily. Vonjo is the first approved therapy that specifically addresses the needs of patients with cytopenic myelofibrosis.

"Today's approval of Vonjo establishes a new standard of care for myelofibrosis patients suffering from cytopenic myelofibrosis," said John Mascarenhas, M.D., Associate Professor, Medicine, Hematology and Medical Oncology, Tisch Cancer Institute, Icahn School of Medicine at Mount Sinai, New York. "Myelofibrosis with severe thrombocytopenia, defined as blood platelet counts below 50 × 109/L, has been shown to result in poor survival outcomes coupled with debilitating symptoms. Limited treatment options have rendered this disease as an area of urgent unmet medical need. I am pleased to see that a new, efficacious and safe treatment option is now available for these patients."

In the U.S., there are approximately 21,000 patients with myelofibrosis, two-thirds of which have cytopenias (thrombocytopenia or anemia), commonly resulting from the toxicity of other approved therapies. Severe thrombocytopenia, defined as a blood platelet count below 50 × 109/L, occurs in one-third of the overall myelofibrosis population, and has a particularly poor prognosis.