AB Science granted authorization from the French Health Authority (ANSM) to initiate a study of AB8939 in the treatment of Acute Myeloid Leukemia (AML)

PRESS RELEASE

AB SCIENCE GRANTED AUTHORIZATION FROM THE FRENCH HEALTH AUTHORITY (ANSM) TO INITIATE A STUDY OF AB8939 IN THE TREATMENT OF ACUTE MYELOID LEUKEMIA (AML)

SECOND AUTHORIZATION FOR PHASE I/II TRIAL AB18001 PERMITS PATIENT RECRUITMENT FROM STUDY SITES IN FRANCE AND CANADA

Paris, 18 October, 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 I/II study (AB18001) evaluating AB8939 in patients with refractory and relapsed AML and refractory myelodysplastic syndrome (MDS). This approval comes just a few weeks after receiving similar authorization from the Canadian Health Authority [1].

Professor Nobert Vey, MD, principal investigator of the study and Director of Clinical Research at Institut Paoli-Calmettes commented, “We are very excited to start the clinical development of AB8939. This drug is based on a well-known therapeutic class of compounds which are useful for the treatment of various cancers, however, AB8939 has a superior potential because it was designed to overcome common mechanisms of drug resistance. Numerous non-clinical data generated at Institut Paoli-Calmettes are already available suggesting that AB8939 is particularly well-suited for treatment of relapsed/refractory AML”.

As previously communicated [1], AB8939 is a new generation synthetic microtubule destabilizer with the ability to overcome multidrug resistance and the potential for broad applicability as a potent anticancer drug. Microtubules play a crucial role in multiple cellular functions which makes them an important target for cancer therapy. Indeed, chemotherapies that target microtubules, such as taxanes and vinca alkaloids, are among the most successful anticancer therapeutics available. Unfortunately, the development of drug resistance (for example, via Pgp efflux pumps that transport the drugs out of the cancer cells) often restrict their clinical efficacy.

Key characteristics of AB8939 are that it circumvents difficulties associated with Pgp-dependent multidrug resistance and is not deactivated by an enzyme named myeloperoxidase, which is an advantage over existing chemotherapies. Another advantage and distinguishing characteristic of AB8939 is that it is a synthetic drug.

The therapeutic potential of AB8939 has been demonstrated through a series of preclinical experiments [2–4]. In vivo data from a highly resistant Ara-C patient derived xenograft (PDX) mouse model showed that AB8939, administered alone or in combination with Ara-C, increased survival relative to single agent Ara-C, with an accompanying significant reduction of blasts in blood and decrease in tumor growth [2]. Ara-C is considered the clinically most relevant cytotoxic drug for AML treatment. In another example, cancerous tumors from patients suffering from resistant acute megakaryoblastic leukemia (an AML subtype) were transplanted into mice. Data showed a complete response in mice treated with AB8939, as compared with rapid disease progression in control animals [3]. No apparent toxicity was observed during the time course of the treatment.

Based on these results, AB8939 was granted orphan drug designation for AML from the U.S. Food and Drug Administration (FDA) [5].

The first indication AB8939 is being developed for is acute myeloid leukemia (AML), a rapid proliferating hematological cancer that originates in the bone marrow and quickly moves into the blood. Cytarabine (Ara-C) is the current standard chemotherapy for AML treatment, however, drug resistance is a major limitation to successful therapy. AB8939 therefore has strong potential as a second or third-line treatment in AML patients who are unfit to receive intensive chemotherapy.

The advantageous mechanistic characteristics of AB8939 mean that it is potentially applicable to a large number of other oncology indications currently treated by microtubule-inhibitor drugs (such as taxanes and vinca alkaloids) and in particular hematological cancers. The envisioned strategy is to position AB8939 in patients with abnormal cytogenetics that make these patients unresponsive to first-line therapy.

AB8939 was entirely discovered by the laboratories of AB Science, which retains full ownership of intellectual rights, and is an example of AB Science’s focus on innovative drug development focused on improving patients’ lives.

About Study AB18001

Study AB18001, titled ‘A Phase 1/2 Study to Assess the Safety, Pharmacokinetics, and Efficacy of Daily Intravenous of AB8939 in patients with Relapsed/Refractory Acute Myeloid Leukemia’, has a multi-stage design. The first part is a dose escalation study that aims to determine the safety and tolerability of intravenous AB8939 in patients with refractory or relapsed AML or patients with refractory MDS, and to determine the recommended dose for the second-stage dose expansion study. This dose expansion study aims to determine the schedule for a Phase 2 trial in patients with relapsed/refractory AML and to also provide an early efficacy (response rate) assessment of AB8939.

About acute myeloid leukemia (AML)

Acute myeloid leukemia (AML) is a serious, life-threating condition and the most common cause of leukemia-related mortality, with a majority of patients facing a highly unsatisfactory prognosis. As such, AML represents an unmet medical need, with limited therapeutic options for patients who are refractory or too frail to benefit from potentially curative but highly toxic treatment, or for those patients that have relapsed following a first complete response. The prevalence of AML in western countries is around 1 per 5,000 persons [6], corresponding to around 100,000 cases in Europe and 60,000 in the USA. Among AML patients, it is estimated that approximately 50% of the patients will not have stem cell transplantation and will relapse. Therefore, the estimated targeted population of AB8938 in AML is around 80,000 people in Europe and the US.

References

[1] Press release dated September 22, 2021

[2] Goubard A, Humbert M, Mansfield C, Hermine O, Dubreuil P, et al. In Vivo Assessment of the Next Generation Microtubule-Destabilizing Agent AB8939 in Patient-derived Xenograft Models of Acute Myeloid Leukemia. Blood (2019) 134 (Supplement_1): 5142. doi.org/10.1182/blood-2019-127143

[3] Goubard A, Humbert M, Mansfield C, Hermine O, Dubreuil P, et al. AB8939, a Microtubule-Destabilizing

Agent with Potential to Overcome Multidrug Resistance, is Active Across the Range (M0–M7) of Acute Myeloid Leukemia Subtypes. Blood (2019) 134 (Supplement_1): 5154. doi.org/10.1182/blood-2019-127021

[4] Humbert M, Goubard A, Mansfield C, Hermine O, Dubreuil P, et al. Anticancer Activity of a Highly Potent Small Molecule Tubulin Polymerization Inhibitor, AB8939. Blood (2019) 134 (Supplement_1): 2075. doi.org/10.1182/blood-2019-122540

[5] Press release dated November 7, 2019

[6] National Cancer Institute (/statfacts/html/amyl.html)

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:

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