Biogen’s Lou Gehrig’s NDA Heads to Panel Review

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FDA has announced a 3/22 Peripheral and Central Nervous System Drugs Advisory Committee to review an NDA for Biogen’s tofersen, an investigational new drug intended to treat superoxide dismutase 1 amyotrophic lateral sclerosis, known as Lou Gehrig’s Disease. Late last year, the agency extended its review by three months, and it revised the user fee review action target date to 4/25/2023. During the review, Biogen submitted responses to FDA information requests, which the agency considered a major amendment that will require additional time, according to the company.

Biogen is seeking accelerated approval for tofersen based on the use of neurofilament as a surrogate biomarker that is reasonably likely to predict clinical benefit. “Neurofilaments are normal proteins found in healthy neurons, that are increased in blood and cerebrospinal fluid when damage has been done to neurons or their axons and are a marker of neurodegeneration,” it says. “In ALS, higher levels of neurofilaments have been found to predict more rapid decline in clinical function and shortened survival. Tofersen study results suggest reductions in neurofilament preceded and predicted slowing of decline in measures of clinical and respiratory function, strength, and quality of life.”

Recent 12-month results showed that individuals with SOD1-ALS who started tofersen earlier experienced a slower rate of decline in clinical and respiratory function, strength and quality of life, Biogen says. It noted that the VALOR Phase 3 study did not meet the primary endpoint of change from baseline to week 28 in the Revised Amyotrophic Lateral Sclerosis Functional Rating Scale. “However, trends of reduced disease progression across multiple secondary and exploratory endpoints were observed,” it says. The 12-month integrated data showed that earlier initiation of tofersen led to sustained reductions in neurofilament, and slowed decline across multiple efficacy endpoints.

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