Positive results from phase III ENERGIZE study of mitapivat in non-transfusion-dependent thalassemia in plenary session at the European Hematology Association 2024 Hybrid Congress.- Agios Pharma

In a related poster presentation (abstract #P1529), the company presented additional data from the ENERGIZE study highlighting clinically meaningful improvements in health-related quality of life measures and patient-reported outcomes among patients in the mitapivat arm compared to those in the placebo arm.

The ENERGIZE study achieved its primary endpoint, with mitapivat demonstrating a statistically significant increase in hemoglobin response rate compared to placebo. Statistical significance was also achieved for both key secondary endpoints associated with change from baseline in FACIT-Fatigue Score and hemoglobin concentration. These improvements were observed across all pre-specified subgroups.

"The data from the ENERGIZE study are compelling, with mitapivat-treated patients achieving meaningful improvements in non-transfusion-dependent thalassemia’s hallmark symptom of anemia as well as in key measures of how patients feel and function,” said Sarah Gheuens, M.D., Ph.D., chief medical officer and head of R&D at Agios. “Together with the recently announced positive results from the ENERGIZE-T study of mitapivat in adults with transfusion-dependent thalassemia, the detailed ENERGIZE results underscore mitapivat’s potential to become an important treatment option for all subtypes of thalassemia – alpha- and beta-thalassemia, transfusion-dependent and non-transfusion-dependent – with the convenience of a pill. We look forward to working with regulators as we anticipate filing for approval in the U.S. by the end of this year.”

“I am pleased to present the results of the ENERGIZE study to my esteemed colleagues and believe they will share my enthusiasm for the positive impact mitapivat may have for patients with non-transfusion-dependent alpha- or beta-thalassemia,” said Ali Taher, M.D., Ph.D., Professor of Medicine, Hematology & Oncology and Director – Naef K. Basile Cancer Institute, American University of Beirut Medical Center in Beirut, Lebanon; an investigator in the ENERGIZE study. “Globally, there are currently no approved oral treatments for non-transfusion-dependent thalassemia, which is characterized by anemia, ineffective erythropoiesis, hemolysis and iron overload and can cause severe complications, reduced quality of life and shortened lifespan. Based on the data collected in the ENERGIZE study, mitapivat has the potential to become a foundational treatment for non-transfusion-dependent thalassemia.”

“The ENERGIZE data presented at this congress show that non-transfusion-dependent alpha- or beta-thalassemia patients treated with mitapivat experienced clinically meaningful improvements in fatigue and walking capacity, as well as improvements in patient-reported outcomes across a range of disease symptoms,” said Kevin Kuo, M.D., MSc, FRCPC; Division of Hematology, University of Toronto in Ontario, Canada; an investigator in the ENERGIZE study. “There is a tremendous need for oral therapies that can improve how people with thalassemia feel and function and reduce the impact of the disease on their lives. Patients with alpha- or beta-thalassemia, regardless of transfusion status, frequently report negative effects on daily activities and physical functioning. On a number of domains of health-related quality of life, adults with non-transfusion-dependent thalassemia experience even greater symptom burden than their transfusion-dependent counterparts. I am excited about the potential of mitapivat to support quality of life improvements for these individuals.”

Agios also recently announced positive results from the Phase III ENERGIZE-T study of mitapivat in adults with transfusion-dependent alpha- or beta-thalassemia. The company intends to file for regulatory approval of mitapivat as a treatment for thalassemia by the end of 2024, incorporating all available data from both studies.

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Results for the Phase III ENERGIZE study were as follows : i. A total of 194 patients were enrolled in the study, with 130 randomized to mitapivat 100 mg twice-daily (BID) and 64 randomized to matched placebo. 122 (93.8%) in the mitapivat arm and 62 (96.9%) in the placebo arm completed the 24-week double-blind period of the study. ii. Baseline demographics and characteristics were balanced between mitapivat and placebo arms, and representative of a population of non-transfusion dependent thalassemia patients. iii. The study met the primary endpoint of hemoglobin response. Hemoglobin response was defined as an increase of greater than 1 g/dL in average hemoglobin concentrations from week 12 through week 24 compared with baseline. a. 42.3% (n=55/130) of patients in the mitapivat arm achieved a hemoglobin response, compared to 1.6% (n=1/64) of patients in the placebo arm (2-sided p<0.0001) .b. among patients who achieved hemoglobin response in the mitapivat arm, the mean change from baseline in average hemoglobin concentration from week 12 to 24 was 1.56 g dl. c. hemoglobin response rates were higher among those treated with mitapivat compared to placebo across all prespecified subgroups, including: x. thalassemia genotype: 23.8% (n="10/42)" of alpha-thalassemia patients in the mitapivat arm achieved a hemoglobin response, compared to no alpha-thalassemia patients in the placebo arm. 51.1% (n="45/88)" of beta-thalassemia patients in the mitapivat arm achieved a hemoglobin response, compared to 2.3% (n="1/44)" of beta-thalassemia patients in the placebo arm. y. baseline hemoglobin concentration: 47.4% (n="45/95)" of patients whose baseline hemoglobin concentration was less than 9.0 g dl in the mitapivat arm achieved a hemoglobin response, compared to 2.1% (n="1/47)" of patients in the placebo arm. 28.6% (n="10/35)" of patients whose baseline hemoglobin concentration was between 9.1 and 10.0 g dl achieved a hemoglobin response, compared to no patients in the placebo arm. iv. treatment with mitapivat also demonstrated statistically significant improvements compared to placebo for both key secondary endpoints: a. the average change from baseline (95% confidence interval) in facit-fatigue (functional assessment of chronic illness therapy-fatigue) subscale score from week 12 to week 24 was 4.85 (3.41, 6.30) in the mitapivat arm compared to 1.46 (–0.43, 3.34) in the placebo arm (p="0.0026)." b. the average change from baseline (95% confidence interval) in average hemoglobin concentration from week 12 to week 24 was 0.86 (0.73, 0.99) g dl in the mitapivat arm compared to –0.11 (–0.28, 0.07) g dl in the placebo arm (p><0.0001). v. improvements were observed in patients treated with mitapivat across measures of health-related quality-of-life, including the six-minute walk test and the patient global impression of change (pgic) fatigue, walking capacity, and thalassemia symptoms subscales. a. six-minute walk test: the average change (95% confidence interval) from baseline to week 24 was 30.48 (19.31, 41.64) meters in the mitapivat arm compared to 7.11 (–7.39, 21.62) in the placebo arm. b. pgic: a higher proportion of patients in the mitapivat arm reported improvements in fatigue as per pgic versus those in the placebo arm at weeks 12, 16, 20, and 24. a higher proportion of patients in the mitapivat arm reported improvements in thalassemia symptoms and walking capacity as per pgic at week 24 versus those in the placebo arm.>

Overall, during the 24-week double-blind period, incidence of adverse events was similar across mitapivat and placebo arms, with 82.9% (n=107) of patients in the mitapivat arm and 79.4% (n=50) of patients in the placebo arm experiencing treatment-emergent adverse events (TEAEs). The most frequently reported TEAEs were headache, initial insomnia, nausea and upper respiratory tract infection.3.9% (n=5) of patients in the mitapivat arm experienced Grade greater then 3 treatment-related TEAEs. There were no serious TEAEs. 3.1% (n=4) of patients in the mitapivat arm experienced TEAEs leading to discontinuation; there were no TEAEs leading to discontinuation in the placebo arm.