AB Science's Masitinib: A Promising Breakthrough in Progressive Multiple Sclerosis

AB Science's masitinib, a novel tyrosine kinase inhibitor, has garnered significant attention in the biotechnology sector, particularly for its potential in treating progressive forms of multiple sclerosis (MS). The company's Phase 3 principal investigator, neurologist Patrick Vermersch, recently featured in an article from the leading publication Life Sciences Magazine, highlighting the promising prospects of masitinib in this indication. This article will delve into the unique mechanism of action of masitinib, its potential advantages, and the key findings from the Phase 2B/3 study, supporting its position as a breakthrough treatment in progressive MS.



Masitinib's unique mechanism of action differentiates it from other treatments in progressive MS by targeting mast cells and microglia, two cells of the innate immune system that play a crucial role in neuroinflammation and disease progression. This targeted approach offers several potential advantages in terms of efficacy and safety, including a novel approach to treating progressive MS, potential long-term benefits, addressing unmet medical needs, and potential safety advantages.

The Phase 2B/3 study of masitinib in progressive MS, known as AB07002, demonstrated several key findings that support the potential of masitinib as a breakthrough treatment in this indication. The study met its primary analysis endpoint, demonstrating a statistically significant reduction in cumulative change on the Expanded Disability Status Scale (EDSS) with masitinib 4.5 mg/kg/day (p=0.0256). This treatment effect was consistent for both primary progressive MS (PPMS) and non-active secondary progressive MS (nSPMS). In addition, masitinib significantly reduced the risk of first disability progression by 42% and the risk of confirmed (3 months) disability progression by 37%. Masitinib also significantly reduced the risk of reaching an EDSS score of 7.0, corresponding to disability severe enough that the patient is restricted to a wheelchair (p=0.0093). The product's safety was consistent with its known risk profile, with no elevated risk of infection.

In comparison, other approved treatments for progressive MS, such as ocrelizumab and siponimod, have shown some modest activity in slowing progressive forms of MS, but this is driven by patients with some degree of inflammatory activity at baseline. The study with masitinib excluded such patients, making it a potential treatment option for patients with non-active progressive MS.

The expected Phase 3 data of masitinib in progressive MS could position it as a breakthrough treatment addressing the unmet needs in this patient population by providing a novel treatment option with a different mechanism of action and potentially complementary to existing therapies. The unique mechanism of action targeting mast cells and microglia, the potential long-term benefits, and the positive results from the Phase 2B/3 study support the potential of masitinib as a promising breakthrough in progressive MS.

As the biotechnology sector continues to evolve, investors should keep a close eye on AB Science and its lead compound, masitinib. The company's innovative approach to treating progressive MS, coupled with the promising results from its clinical trials, positions masitinib as a strong contender in the MS treatment landscape. With the expected Phase 3 data on the horizon, investors may want to consider adding AB Science to their watchlist as a potential investment opportunity in the biotechnology sector.