AstraZeneca’s Koselugo OK’d for Pediatric Neurofibromatosis
FDA has approved an AstraZeneca NDA for Koselugo (selumetinib) for treating of pediatric patients with neurofibromatosis type 1 (NF1), a nervous system genetic disorder that causes tumors to grow on nerves. FDA says that Koselugo is approved specifically for patients who have symptomatic, inoperable plexiform neurofibromas (PN), which are tumors involving the nerve sheaths that can grow anywhere in the body.
NF1 is a mutation or flaw in a particular gene, and it is usually diagnosed in early childhood and appears in an estimated 1 out of every 3,000 infants, FDA says. It approved Koselugo based on a clinical trial conducted by the National Cancer Institute involving 50 patients who had routine evaluations of changes in tumor size and tumor-related morbidities during the trial. The overall response rate was 66% and all patients had a partial response, meaning that no patients had complete disappearance of the tumor, the agency says, adding that “82% had a response lasting 12 months or longer. Other clinical outcomes for patients during Koselugo treatment including changes in PN-related disfigurement, symptoms and functional impairments. Although the sample sizes of patients assessed for each PN-related morbidity (such as disfigurement, pain, strength and mobility problems, airway compression, visual impairment and bladder or bowel dysfunction) were small, there appeared to be a trend of improvement in PN-related symptoms or functional deficits during treatment.”
On the safety side, FDA says common side effects observed were vomiting, rash, abdominal pain, diarrhea, nausea, dry skin, fatigue, musculoskeletal pain, fever, acneiform rash, stomatitis, headache, paronychia and pruritus. Because the drug can cause serious side effects including heart failure and ocular toxicity, the agency recommends that patients should have cardiac and ophthalmic assessments performed prior to initiating Koselugo and at regular treatment intervals.