AB Science granted authorization to initiate confirmatory Phase III trial of masitinib in progressive forms of multiple sclerosis by the French Health Authority (ANSM)

PRESS RELEASE

AB SCIENCE HAS BEEN GRANTED AUTHORIZATION TO INITIATE CONFIRMATORY PHASE III TRIAL OF MASITINIB IN PROGRESSIVE FORMS OF MULTIPLE SCLEROSIS BY THE FRENCH HEALTH AUTHORITY (ANSM)

Paris, 03 January, 2021, 6pm CET

AB Science SA (Euronext - FR0010557264 - AB) today announces that it has been authorized by the French Medicine Agency, ANSM, to initiate a Phase III study (AB20009) evaluating masitinib in patients with Primary Progressive Multiple Sclerosis (PPMS) or non-active Secondary Progressive Multiple Sclerosis (nSPMS).

Study AB20009 is titled ‘A 96-Week, Prospective, Multicenter, Randomised, Double-Blind, Placebo-Controlled, Phase 3 Study to Compare Efficacy and Safety of Masitinib Dose Titration to 4.5 mg/kg/day versus Placebo in the Treatment of Patients with Primary Progressive or Secondary Progressive Multiple Sclerosis Without Relapse’.

The study will enroll 800 patients from numerous study centers with Expanded Disability Status Scale (EDSS) score between 3.0 to 6.0 and absence of T1 Gadolinium-enhancing brain lesions as measured by magnetic resonance imaging (MRI).

The primary objective of the study will be to evaluate the effect of masitinib on time to confirmed disability progression, with progression defined as 1-point worsening when EDSS baseline score ≤5.5, or 0.5 if baseline score >5.5 from randomization to week 96.

Professor Patrick Vermersch, MD, principal investigator of the study and Professor of Neurology at the University of Lille, France commented, “We are very excited to initiate this confirmatory phase III study with masitinib in progressive forms of multiple sclerosis. To date, the vast majority of treatments for the management of multiple sclerosis target the patient's adaptive immune system and therefore apply mainly to the relapsing remitting forms of the disease. However, patients suffering from a progressive form of the disease currently account for approximately 50% of MS cases.”

Professor Olivier Hermine, President of the Scientific Committee of AB Science and member of the Académie des Sciences in France said, “To date, there is no treatment capable of effectively targeting those cells of the innate immune system that are associated with the pathology of progressive forms of multiple sclerosis. Masitinib selectively targets these cells. Furthermore, masitinib is not an immunosuppressive treatment, which is particularly important in MS patients who need to receive long-term treatment and who, in certain cases, already have a weakened immune system due to previous treatments or because of their age.”

This confirmatory study follows successful completion of a first Phase 2B/3 study (AB07002) in primary progressive (PPMS) and non-active secondary progressive (nSPMS) multiple sclerosis. Results from that study were presented during the 8^th Joint Americas Committee for Treatment and Research in Multiple Sclerosis (ACTRIMS) – European Committee for Treatment and Research in Multiple Sclerosis (ECTRIMS) Meeting (MSVirtual2020). The study met its primary analysis endpoint, demonstrating a statistically significant reduction in cumulative change on EDSS with masitinib 4.5 mg/kg/day (p=0.0256). This treatment-effect was consistent for PPMS and 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).

A strong medical need for the progressive forms of multiple sclerosis
Multiple sclerosis is an autoimmune disease of the central nervous system that affects more than 100,000 people in France and for which no definitive treatment exists to date. It is characterized by a progressive degradation of the nerve cells of the central nervous system by the patient's immune system and comes in two main forms.
The relapsing-remitting form characterized by relapses of the disease. During these relapses, patients experience the onset of new symptoms or the worsening of symptoms already present. These flare-ups are usually followed by recovery periods of varying length, after which some symptoms may persist. The relapsing-remitting forms of multiple sclerosis are mostly associated with dysfunctions of adaptive immunity (B cells and T cells).
The progressive form, characterized by a constant and regular worsening of the symptoms of the disease, without a distinct relapse or period of recovery. The rate of onset of severe, disabling, and irreversible disability is much higher in the progressive forms of the disease than in the relapsing remitting forms. In progressive multiple sclerosis, innate immune cells such as macrophages, microglia or mast cells have been shown to probably play a major role.

About AB Science
Founded in 2001, AB Science is a pharmaceutical company specializing in the research, development and commercialization of protein kinase inhibitors (PKIs), a class of targeted proteins whose action are key in signaling pathways within cells. Our programs target only diseases with high unmet medical needs, often lethal with short term survival or rare or refractory to previous line of treatment.
AB Science has developed a proprietary portfolio of molecules and the Company’s lead compound, masitinib, has already been registered for veterinary medicine and is developed in human medicine in oncology, neurological diseases, inflammatory diseases and viral diseases. The company is headquartered in Paris, France, and listed on Euronext Paris (ticker: AB).

Further information is available on AB Science’s website:
www.ab-science.com.

Forward-looking Statements - AB Science
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These forward-looking statements can often be identified by the words "expect", "anticipate", "believe", "intend", "estimate" or "plan" as well as other similar terms. While AB Science believes these forward-looking statements are reasonable, investors are cautioned that these forward-looking statements are subject to numerous risks and uncertainties that are difficult to predict and generally beyond the control of AB Science and which may imply that results and actual events significantly differ from those expressed, induced or anticipated in the forward-looking information and statements. These risks and uncertainties include the uncertainties related to product development of the Company which may not be successful or to the marketing authorizations granted by competent authorities or, more generally, any factors that may affect marketing capacity of the products developed by AB Science, as well as those developed or identified in the public documents published by AB Science. AB Science disclaims any obligation or undertaking to update the forward-looking information and statements, subject to the applicable regulations, in particular articles 223-1 et seq. of the AMF General Regulations.

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AB Science
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Attachment

• CP Phase III MS ANSM VEng VF