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First Clinical Data with MGTA-145 Show Single-Day Dosing and Collection of Robust Numbers of High-Quality Stem Cells in Healthy Volunteers

Magenta Therapeutics (NASDAQ: MGTA), a clinical-stage biotechnology company developing novel medicines to bring the curative power of immune reset to more patients, today announced that new results from its MGTA-145 stem cell mobilization program were presented at the 61st Annual Meeting of the American Society of Hematology (ASH). These results, which were presented by John DiPersio, M.D., Ph.D., Professor of Medicine and Chief of the Oncology Division, Washington University School of Medicine, St. Louis, Missouri, showed that MGTA-145 in combination with plerixafor met all the endpoints in the study, and safely mobilized a large number of high-quality stem cells in a single day. The cells were then shown to engraft in a humanized mouse model.

Mobilized peripheral blood is used for the majority of the 65,000 stem cell transplants performed each year across the United States and Europe, but the current standard of care, G-CSF, requires at least five days of dosing and is associated with significant side effects, including bone pain that often requires narcotics. Further, patients with autoimmune diseases or sickle cell disease can have severe side effects with G-CSF, including potentially fatal complications.

Magenta is developing MGTA-145 as the new first-line standard of care for stem cell mobilization in a broad range of diseases, including autoimmune diseases and genetic diseases. MGTA-145, a CXCR2 agonist, works in combination with plerixafor, a CXCR4 antagonist, to harness the physiological mechanism of stem cell mobilization.

"The current standard of care for stem cell mobilization, G-CSF, requires five or more days of injections, which is difficult for patients, donors and the healthcare system. The novel mechanism of MGTA-145 may enable single-day dosing, mobilization and collection in all donors and patients, including those with sickle cell disease or autoimmune diseases, and positions it as a promising new first-line standard of care for all transplants as well as gene therapy," said Dr. DiPersio.

"These initial results in a healthy volunteer setting validate the unique mechanism of action of MGTA-145 and its ability to mobilize sufficient hematopoietic stem cells for transplant in combination with plerixafor. We are particularly pleased to see the high percentage of CD34+CD90+ cells collected in healthy volunteers, as preclinical data suggest that these cells are correlated with engraftment. Our initial results support this, with rapid engraftment of the collected cells observed in humanized mouse models," said John Davis, M.D., M.P.H., Chief Medical Officer, Magenta. "The unique mechanism, single-day dosing and collection of robust numbers of cells that engraft quickly highlight the potential utility for MGTA-145 across multiple diseases and hold promise for future development in allogenic donors as well as patients."

Results from the MGTA-145 Phase 1 Study in Healthy Volunteers

Title: Rapid and Robust Mobilization of CD34+ HSCs without G-CSF Following Administration of MGTA-145 Alone and in Combination with Plerixafor (Abstract #1961)

Presenter: John DiPersio, M.D., Ph.D., Professor of Medicine and Chief of the Oncology Division, Washington University School of Medicine, St. Louis, Missouri

This study consists of four parts:

Endpoints include safety and tolerability, pharmacokinetics, target engagement, and pharmacodynamic effects.

Results presented by Dr. DiPersio showed:

About Magenta Therapeutics

Magenta Therapeutics is a clinical-stage biotechnology company developing medicines to bring the curative power of immune system reset through stem cell transplant to more patients with autoimmune diseases, genetic diseases and blood cancers. Magenta is combining leadership in stem cell biology and biotherapeutics development with clinical and regulatory expertise, a unique business model and broad networks in the stem cell transplant world to revolutionize immune reset for more patients.

Magenta is based in Cambridge, Mass. For more information, please visit www.magentatx.com.

Follow Magenta on Twitter: @magentatx.

Forward-Looking Statement

This press release may contain forward-looking statements and information within the meaning of The Private Securities Litigation Reform Act of 1995 and other federal securities laws. The use of words such as "may," "will," "could", "should," "expects," "intends," "plans," "anticipates," "believes," "estimates," "predicts," "projects," "seeks," "endeavor," "potential," "continue" or the negative of such words or other similar expressions can be used to identify forward-looking statements. The express or implied forward-looking statements included in this press release are only predictions and are subject to a number of risks, uncertainties and assumptions, including, without limitation risks set forth under the caption "Risk Factors" in Magenta's Registration Statement on Form S-1, as updated by Magenta's most recent Quarterly Report on Form 10-Q and its other filings with the Securities and Exchange Commission. In light of these risks, uncertainties and assumptions, the forward-looking events and circumstances discussed in this press release may not occur and actual results could differ materially and adversely from those anticipated or implied in the forward-looking statements. You should not rely upon forward-looking statements as predictions of future events. Although Magenta believes that the expectations reflected in the forward-looking statements are reasonable, it cannot guarantee that the future results, levels of activity, performance or events and circumstances reflected in the forward-looking statements will be achieved or occur. Moreover, except as required by law, neither Magenta nor any other person assumes responsibility for the accuracy and completeness of the forward-looking statements included in this press release. Any forward-looking statement included in this press release speaks only as of the date on which it was made. We undertake no obligation to publicly update or revise any forward-looking statement, whether as a result of new information, future events or otherwise, except as required by law.

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News published on 7 december 2019 at 17:35 and distributed by: