MEI Pharma and Helsinn Group Discontinue Phase 3 Study of Pracinostat in AML After Interim Analysis

Lugano, Switzerland and San Diego, USA, July 2, 2020 – Helsinn, a Swiss pharmaceutical group focused on building quality cancer care and rare diseases products, and MEI Pharma, Inc. (Nasdaq: MEIP), a late-stage pharmaceutical company focused on advancing potential new therapies for cancer, today announce that an interim futility analysis of the ongoing Phase 3 study of pracinostat in combination with azacitidine in patients with AML who are unfit to receive standard intensive chemotherapy, undertaken by the study Independent Data Monitoring Committee (“IDMC”), has demonstrated it was unlikely to meet the primary endpoint of overall survival compared to the control group. Based on the outcome of the interim analysis, the decision was made to discontinue the recruitment of patients and end the study. The decision was based on a lack of efficacy and not on safety concerns. Pending further evaluation, patients currently enrolled in other pracinostat studies will continue treatment.

About AML

Acute Myeloid Leukemia (AML) is a disorder of the blood and bone marrow caused by the uncontrolled proliferation of an abnormal hematopoietic cell of myeloid lineage. This results in a high circulating number of immature blood cells and replacement of normal bone marrow by malignant cells. AML has various subtypes, which are based on the type of cell from which the leukemia developed. It is typically a disease of older patients, with a median age at diagnosis of 67 years. Whilst the cure rate with intensive chemotherapy for AML patients who are 60 or younger is 35 to 40%, the rate is poor in older patients, typically not exceeding 15%.

About Pracinostat

Pracinostat is an oral histone deacetylase (“HDAC”) inhibitor that is being investigated in combination with azacitidine for the treatment of adults with newly diagnosed acute myeloid leukemia (“AML”) who are unfit for standard intensive chemotherapy. It is also being evaluated in a Phase II study in patients with high or very high-risk myelodysplastic syndromes (“MDS”). The U.S. Food and Drug Administration (FDA) and the European Medicines Agency (EMA) have granted Orphan Drug Designation for pracinostat in combination with azacitidine for the treatment of patients with newly diagnosed AML who are ≥75 years of age or unfit for intensive chemotherapy. In addition, the FDA has granted Breakthrough Therapy Designation to the combination treatment.

In August 2016, Helsinn and MEI Pharma entered an exclusive license, development and commercialization agreement for pracinostat in AML and other potential indications. The agreement provides that Helsinn is primarily responsible for development and commercialization costs for pracinostat in AML and other indications, including MDS.

Pracinostat is an investigational agent and is not approved for commercial use in the U.S. or any other country worldwide.

About the Helsinn Group

Helsinn is a privately-owned Swiss Pharma Company which, since 1976, has been improving the lives of patients, guided by core family values of respect, integrity and quality. The Group has an extensive portfolio of marketed innovative cancer and rare disease therapies, a robust drug development pipeline and ambitions to further accelerate its growth through in-licensing and acquisition to address unmet medical needs. Helsinn operates a unique integrated licensing business model, achieving success with over 80 long-standing partners in 190 countries, who share our values. The Group’s pharmaceutical business, (Helsinn Healthcare) is headquartered in Lugano, Switzerland with operating subsidiaries in the U.S. (Helsinn Therapeutics US) and China (Helsinn Pharmaceuticals China) which market the Group’s products directly in these countries. The Group has additional operating subsidiaries in Switzerland (Helsinn Advanced Synthesis, an active pharmaceutical ingredient manufacturer) and Ireland (Helsinn Birex Pharmaceuticals, a drug product manufacturer). Helsinn Investment Fund was created to enhance the future of healthcare by providing funding and strategic support to innovative companies.

Helsinn Group plays an active and central role in promoting social transformation in favor of people and the environment. Corporate social responsibility is at the heart of everything we do which is reinforced in the company’s strategic plan by a commitment to sustainable growth.

To learn more about Helsinn Group please visit www.helsinn.com

About MEI Pharma

MEI Pharma, Inc. (Nasdaq: MEIP) is a late-stage pharmaceutical company focused on developing potential new therapies for cancer. MEI Pharma’s portfolio of drug candidates contains four clinical-stage assets, including ME-401, currently in an ongoing Phase 2 clinical trial which may support an accelerated approval marketing application with the U.S. Food and Drug Administration. Each of MEI Pharma’s pipeline candidates leverages a different mechanism of action with the objective of developing therapeutic options that are: (1) differentiated, (2) address unmet medical needs and (3) deliver improved benefit to patients either as standalone treatments or in combination with other therapeutic options. For more information, please visit www.meipharma.com.

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