Eisai and Biogen Present Detailed Results from Phase II Clinical Study of Elenbecestat in MCI and Mild to Moderate Alzheimer’s Disease at AAIC 2018

Product name:Eisai and Biogen Present

2018/07/27 update

Industry:BioTech

TOKYO, Jul 26, 2018 - (JCN Newswire) - Eisai Co., Ltd. and Biogen Inc. (Nasdaq: BIIB) announced detailed results from a Phase II clinical study (Study 202) of the investigational oral BACE (beta amyloid cleaving enzyme) inhibitor elenbecestat (development code: E2609) at the Alzheimer's Association International Conference (AAIC) 2018 being held in Chicago, Illinois, United States, from July 22 to 26, 2018. This poster presentation was accepted as a Late Breaking Abstract for AAIC (Poster No.: P4-389).

Study 202 (ClinicalTrials.gov identifier NCT02322021) is a multicenter, randomized, double-blind, placebo- controlled parallel-group 18-month Phase II clinical study, conducted in the United States in patients with mild cognitive impairment (MCI) due to Alzheimer's disease, or mild to moderate dementia due to Alzheimer's disease (AD) with confirmed amyloid pathology by positron emission tomography (PET). Seventy patients were randomized to four treatment arms receiving elenbecestat (5, 15, or 50 mg) or placebo daily. During the study period, more than half the patients in the elenbecestat 5 mg and 15 mg arms were switched to the 50 mg arm. These patients received elenbecestat 50 mg for three months or longer. Analysis was carried out on the combination of patients in the initial 50 mg treatment arm plus the patients switched to the 50 mg arm, referred to collectively as the "50 mg total group arm" (38 patients). In addition to the primary safety objective, the study assessed amyloid pathology in the brain at 18 months as measured by amyloid PET as well as efficacy in terms of clinical symptoms, which were exploratory objectives in this study.

The primary objective of the study was to assess the safety and tolerability of elenbecestat after 18 months of treatment. The incidence of treatment-emergent adverse events was similar between elenbecestat and placebo, and no dose-dependent response was observed for adverse events. The six most common adverse events reported were upper respiratory tract infection, abnormal dreams and nightmares, contact dermatitis, headache, diarrhea, and falls. No adverse reactions suggestive of hepatic toxicity were observed in this study.

Regarding the accumulation of amyloid in the brain at 18 months as measured by PET via quantitative evaluation of Standard Uptake Value Ratio (SUVr) using the florbetaben PET tracer (n=28), a statistically significant reduction of brain amyloid load as compared to placebo was observed in the 50 mg total group arm with a reduction in SUVr of 0.104 (p=0.011). Although a small sample size, using the florbetapir PET tracer (n=7) demonstrated a statistically significant decrease in brain amyloid load compared to placebo for the 50 mg total group arm (reduction in SUVr of 0.227) at 18 months (p=0.024).

Clinical efficacy was evaluated using the Clinical Dementia Rating Sum of Boxes (CDR-SB) rating scale. After 18 months of treatment, clinical assessment using CDR-SB demonstrated a mean treatment difference of -0.5 based off of an increase of 1.1 for the elenbecestat 50 mg total group arm (29 patients) versus an increase of 1.6 for the placebo group (12 patients). This represented a 31% slowing in rate of decline for the elenbecestat arm which is potentially considered to be clinically important.

Furthermore, based on information obtained from analyses of changes in CDR-SB and amyloid PET SUVr values from ADNI data, in a sub-population analysis of patients with baseline SUVr range between 1.4 and 1.9 who were identified in this study as being expected to have a higher rate of disease progression, there was 72% less decline in CDR-SB for patients in the 50 mg total group arm (n=10) versus placebo (n=5). While the study was not powered to show statistical significance compared to placebo on clinical symptoms, the results suggest that elenbecestat could slow decline in cognitive function of patients with MCI due to Alzheimer's disease, or mild to moderate dementia due to Alzheimer's disease.

Elenbecestat, discovered by Eisai, has been jointly developed by Eisai and Biogen since March 2014. The two companies are currently conducting two global Phase III clinical studies (MISSION AD1/2) in early Alzheimer's disease.

This release discusses investigational uses of agents in development and is not intended to convey conclusions about efficacy or safety. There is no guarantee that such investigational agent will successfully complete clinical development or gain health authority approval.

About Elenbecestat (generic name, development code: E2609)

Elenbecestat is an oral BACE (beta amyloid cleaving enzyme) inhibitor discovered by Eisai currently being investigated in Phase III clinical studies for Alzheimer's disease. By inhibiting BACE, a key enzyme in the production of Abeta peptides, elenbecestat reduces Abeta production, which is thought to lead to a reduction in amyloid plaque formations caused by the aggregation of toxic oligomers and protofibrils in the brain. Currently, two global Phase III clinical studies (MISSION AD1/2) of elenbecestat in early Alzheimer's disease including mild cognitive impairment (MCI) due to AD/Prodromal AD and the early stages of mild AD are underway. In addition, the U.S. Food and Drug Administration (FDA) has granted Fast Track designation for the development of elenbecestat, a process designed to facilitate the development, and expedite the review of drugs to treat serious conditions and fill an unmet medical need.

About Study 202 (ClinicalTrials.gov identifier NCT02322021)

Study 202 is a placebo-controlled, double-blind, parallel-group, randomized, dose-finding study to evaluate the safety and tolerability of elenbecestat in 70 patients with mild cognitive impairment due to Alzheimer's disease (prodromal Alzheimer's disease) and mild to moderate dementia due to Alzheimer's disease. The study enrolled patients which met the core clinical research criteria of the U.S. National Institute on Aging - Alzheimer's Association for MCI due to AD or AD dementia, with an MMSE score of 16 or higher and confirmed accumulation of Abeta by PET screening. Patients were allocated to a total of four treatment arms, three for elenbecestat (5 mg/day: 17 patients, 15 mg/day: 19 patients, 50 mg/day: 17 patients) and one for placebo (17 patients). More than half the patients in the elenbecestat 5 mg and 15 mg treatment arms had their dose increased to 50 mg/day during the 18 month treatment period. Mean duration of 50 mg total group arm on 50 mg/day was 11 months. The primary objectives are safety and tolerability after 18 months. Major exploratory endpoints are the change in accumulation of Abeta as measured by amyloid PET (35 patients) and the change in dementia assessment scales including CDR-SB and ADCOMS (41 patients), at 18 months compared to baseline.

1) SUVr (Standard Uptake Value Ratio): SUVr calculates the ratio of strength of accumulation of PET tracer in a region of interest in the brain to an area of the brain (reference region) which shows low and stable accumulation of PET tracer. These SUVr values can be used to quantitatively compare and evaluate the accumulation of amyloid.
2) CDR-SB (Clinical Dementia Rating scale Sum of Boxes): The Clinical Dementia Rating (CDR) is a numeric scale used to quantify the severity of symptoms of dementia. A qualified health professional assesses a patient's cognitive and functional performance in six areas: memory, orientation, judgment & problem solving, community affairs, home & hobbies, and personal care. The total score of the six areas is the score of CDR-SB, and it is an appropriate item for evaluating the effectiveness of therapeutic drugs targeting early stage AD.

About the Joint Development Agreement between Eisai and Biogen for Alzheimer's Disease

Eisai and Biogen are widely collaborating on the joint development and commercialization of Alzheimer's disease treatments. Eisai serves as the lead in the co-development of elenbecestat, a BACE inhibitor, and BAN2401, an anti-amyloid beta (Abeta) protofibril antibody, while Biogen serves as the lead for co-development of aducanumab, Biogen's investigational anti-amyloid beta (Abeta) antibody for patients with Alzheimer's disease, and the companies plan to pursue marketing authorizations for the three compounds worldwide. If approved, the companies will also co-promote the products in major markets, such as the United States, the European Union and Japan.

About Biogen

At Biogen, our mission is clear: we are pioneers in neuroscience. Biogen discovers, develops, and delivers worldwide innovative therapies for people living with serious neurological and neurodegenerative diseases. One of the world's first global biotechnology companies, Biogen was founded in 1978 by Charles Weissmann, Heinz Schaller, Kenneth Murray, and Nobel Prize winners Walter Gilbert and Phillip Sharp, and today has the leading portfolio of medicines to treat multiple sclerosis; has introduced the first and only approved treatment for spinal muscular atrophy; and is focused on advancing neuroscience research programs in Alzheimer's disease and dementia, neuroimmunology, movement disorders, neuromuscular disorders, pain, ophthalmology, neuropsychiatry, and acute neurology. Biogen also manufactures and commercializes biosimilars of advanced biologics.

Biogen routinely posts information that may be important to investors on its website at www.biogen.com.

About Eisai

Eisai Co., Ltd. (TSE:4523; ADR:ESALY) is a research-based human health care (hhc) company that discovers, develops and markets products throughout the world. Eisai focuses its efforts in three therapeutic areas: integrative neuroscience, including neurology and psychiatric medicines; integrative oncology, which encompasses oncotherapy and supportive-care treatments; and vascular/immunological reaction. Through a global network of research facilities, manufacturing sites and marketing subsidiaries, Eisai actively participates in all aspects of the worldwide healthcare system. For more information about Eisai Co., Ltd., please visit www.eisai.com.

Contact:
Biogen Inc.
Public Affairs
Tel: +1-781-464-3260
E-mail: public.affairs@biogen.com

Eisai Co., Ltd.
Public Relations Department
Tel: +81-(0)3-3817-5120
E-mail: Patricia_Councill@eisai.com
Tel: +1-201-746-2139
Copyright 2018 JCN Newswire. All rights reserved. www.jcnnewswire.com

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