FDA Rejects Xspray Pharma's Nilopki Application
FDA has issued Xspray Pharma a complete response letter for the company's NDA for Nilopki, an improved formulation of nilotinib designed to compete with Novartis' chronic myeloid leukemia (CML) therapy Tasigna. FDA told the company that it is unable to approve the application in its current form, citing concerns related to dosing comparability, manufacturing data and outstanding issues involving a third-party manufacturing facility.
According to the company, FDA identified three primary deficiencies in the application. First, reviewers said the proposed labeling and dosing regimen must establish a single corresponding Nilopki dose level for each Tasigna dose level, beginning with a dose that produces drug exposure comparable to Tasigna's 200-milligram strength.
Second, FDA requested additional information demonstrating commercial-scale manufacturing capability for batches of nilotinib produced using Xspray's amorphous solid dispersion technology.
Third, the agency indicated that Xspray's contract manufacturing partner must adequately address observations identified during an FDA inspection. The agency also noted that a pre-approval inspection related to Xspray's manufacturing operations may still be required before approval can be granted.
Xspreay says Nilopki was developed as an improved version of Tasigna for patients with chronic myeloid leukemia. Xspray has contended that the product addresses one of the most burdensome aspects of current nilotinib therapy: strict fasting requirements. Patients taking Tasigna must avoid food before and after dosing, resulting in up to six hours of fasting daily, it says.