Sobi Receives US FDA Fast Track Designation for pacritinib in VEXAS Syndrome. Pacritinib (Vonjo) is a kinase inhibitor (JAK2, FLT3) that is approved to treat adults with intermediate or high-risk myelofibrosis https://t.co/V7duJPyJpG https://t.co/Dn5DgeaX7N