Gilead Granted Exclusive Option to License MGD024, a Phase 1 CD123×CD3 DART® Molecule with Potential to Treat Various Hematologic Malignancies

Potential for Companies to Collaborate on Two Additional Future Research Programs

FOSTER CITY, CA & ROCKVILLE, MA, USA I October 17, 2022 I Gilead Sciences, Inc. (NASDAQ: GILD) and MacroGenics (NASDAQ: MGNX) today announced an exclusive option and collaboration agreement to develop MGD024, an investigational, bispecific antibody that binds CD123 and CD3 using MacroGenics’ DART® platform, and two additional bispecific research programs. The collaboration agreement grants Gilead the option to license MGD024, a potential treatment for certain blood cancers, including acute myeloid leukemia (AML) and myelodysplastic syndromes (MDS).

A leader in the bispecific antibody space, MacroGenics has extensive experience applying its proprietary DART platform to develop novel therapeutics. MGD024 is a next-generation, bispecific that incorporates a CD3 component that is designed to minimize cytokine-release syndrome (CRS), a potentially life-threatening toxicity, while increasing the magnitude of antitumor activity with a longer half-life to permit intermittent dosing.

“MacroGenics’ bispecific expertise naturally complements Gilead’s portfolio strengths in immuno-oncology and our growing hematology franchise,” said Bill Grossman, MD, PhD, Senior Vice President, Oncology Clinical Development, Gilead Sciences. “We believe MGD024, with its potential to reduce CRS and permit intermittent dosing through a longer half-life, could translate to more patient-friendly dosing and enhanced clinical outcomes for people living with AML and MDS. This partnership is the latest in our efforts to develop and advance transformative new cancer therapies as we deepen our portfolio across oncology indications.”

Scott Koenig, MD, PhD, President, and CEO, MacroGenics said, “Rapid advances over the last decade have made CD123 a very promising target in oncology research. Advancing our bispecific DART molecule, MGD024, through a strategic collaboration with the team at Gilead will accelerate our ability to drive further development of MGD024 to the potential benefit of people living with blood cancers.”

MacroGenics will be responsible for the ongoing Phase 1 study for MGD024 during which Gilead may elect to exercise its option to license the program at predefined decision points. The Phase 1 study will include a dose escalation segment and an expansion segment that is intended to evaluate MGD024 as monotherapy and in combination with other therapies across multiple indications.

Financial Considerations

As part of the agreement, Gilead will pay MacroGenics an upfront payment of $60 million and MacroGenics will be eligible to receive up to $1.7 billion in target nomination, option fees, and development, regulatory and commercial milestones. MacroGenics will also be eligible to receive tiered, double-digit royalties on worldwide net sales of MGD024 and a flat royalty on worldwide net sales of products under the two research programs.

Beginning in the first quarter of 2022, consistent with recent industry communications from the U.S. Securities and Exchange Commission (SEC), Gilead no longer excludes acquired IPR&D expenses from its non-GAAP financial measures and expects the transaction with MacroGenics to reduce Gilead’s GAAP and non-GAAP 2022 EPS by approximately $0.04.

About MacroGenics, Inc.

MacroGenics is a biopharmaceutical company focused on developing and commercializing innovative monoclonal antibody-based therapeutics for the treatment of cancer. The company generates its pipeline of product candidates primarily from its proprietary suite of next-generation antibody-based technology platforms, which have applicability across broad therapeutic domains. The combination of MacroGenics’ technology platforms and protein engineering expertise has allowed the company to generate promising product candidates and enter into several strategic collaborations with global pharmaceutical and biotechnology companies. For more information, please see the company’s website at www.macrogenics.com. MacroGenics, the MacroGenics logo, and DART are trademarks or registered trademarks of MacroGenics, Inc.

About Gilead Sciences

Gilead Sciences, Inc. is a biopharmaceutical company that has pursued and achieved breakthroughs in medicine for more than three decades, with the goal of creating a healthier world for all people. The company is committed to advancing innovative medicines to prevent and treat life-threatening diseases, including HIV, viral hepatitis, and cancer. Gilead operates in more than 35 countries worldwide, with headquarters in Foster City, California.

SOURCE: Gilead Sciences