• Advancement of HER2 franchise led by margetuximab
  • Expansion and progression of B7-H3 franchise
  • Introduction of PD-1 directed immuno-oncology franchise
  • Clinical updates on multiple DART® studies underscore platform progress
  • Pipeline poised to expand with at least 3 new INDs from internal R&D in 2017-2018

ROCKVILLE, MD, USA  December 13, 2016 I MacroGenics, Inc. (MGNX), a clinical-stage biopharmaceutical company focused on discovering and developing innovative monoclonal antibody-based therapeutics for the treatment of cancer, as well as autoimmune disorders and infectious diseases, today provided an update on several of the Company’s product candidates and technology platforms.

“At today’s R&D Day, MacroGenics highlighted the continued progress our team is making to advance our growing portfolio of potential treatment options for patients with cancer, autoimmune disorders and infectious diseases,” said Scott Koenig, M.D., Ph.D., President and CEO of MacroGenics. “Today, we reviewed our expanded strategy for pursuing a balanced approached across novel and validated targets to develop three immuno-oncology franchises centered around HER2, B7-H3 and PD-1. This approach underscores our belief that cancer patients may significantly benefit from combinatorial and multi-specific strategies that are directly addressed by our core scientific expertise in creating and developing antibody, DART and TRIDENT™ therapeutics. The promising updates we provided on 11 of our programs today underscore the potential of our approach.”

Program Updates and Highlights:

HER2 Franchise. MacroGenics provided an update regarding its most advanced franchise targeting the human epidermal growth factor receptor 2, or HER2, led by margetuximab, its Fc-optimized monoclonal antibody:

  • Phase 3 Metastatic Breast Cancer Study. The pivotal SOPHIA study is evaluating the efficacy of margetuximab plus chemotherapy compared to trastuzumab plus chemotherapy in approximately 530 relapsed/refractory HER2-positive metastatic breast cancer patients. MacroGenics today confirmed that it expects to complete enrollment of this study by late 2018.
  • Phase 2 Gastric Cancer Combination of Margetuximab with Anti-PD-1 mAb. The Company presented initial clinical data from a Phase 1b/2 trial of margetuximab in combination with an anti-PD-1 monoclonal antibody (pembrolizumab) in advanced HER2-positive gastric and gastroesophageal junction cancer patients. Preliminary data from the dose escalation portion of the study includes patients with objective response following progression on previous lines of treatment with trastuzumab and chemotherapy.
  • Pre-Clinical DART Program. MacroGenics presented preliminary non-clinical data from a DART program designed to engage both HER2 and CD137 (4-1BB), a costimulatory molecule, allowing for tumor-targeted immune cell activation.

B7-H3 Franchise. MacroGenics highlighted its industry-leading franchise related to the therapeutic targeting of B7-H3, a member of the B7 family of molecules involved in immune regulation, that is broadly expressed in multiple solid tumors:

  • Enoblituzumab. The Company provided clinical updates on ongoing monotherapy and combination studies with enoblituzumab, an Fc-optimized monoclonal antibody. In the Phase 1 monotherapy study, the antibody continues to be well-tolerated and the most promising activity to-date has been observed in prostate, bladder and post-checkpoint melanoma patients, consistent with what has been previously reported. Combination studies of enoblituzumab with either an anti-CTLA-4 mAb (ipilimumab) or anti-PD-1 mAb (pembrolizumab) indicate a manageable safety profile to date as well as initial signs of antitumor activity.
  • MGD009. MacroGenics presented initial data from the ongoing Phase 1 dose escalation study of MGD009, a bispecific B7-H3 x CD3 DART molecule. Adverse events have been manageable to date and initial signs of antitumor activity have been observed in three patients with triple negative breast cancer, renal cell carcinoma and mesothelioma.
  • MGC018. The Company introduced MGC018, an anti-B7-H3 antibody drug conjugate (ADC) based on a duocarmycin payload with cleavable peptide linker licensed from Synthon Biopharmaceuticals. The Company plans to submit an Investigational New Drug (IND) application for MGC018 in 2018.

PD1-Directed Immuno-Oncology Franchise. MacroGenics introduced several new programs in its pipeline directed towards PD-1, which will enable both a broad set of combination opportunities across its portfolio and further differentiation from existing PD-1-based treatment options: 

  • MGA012. The Company introduced MGA012, an anti-PD-1 monoclonal antibody that recently began a Phase 1 clinical study. With anti-PD-1 therapy becoming a mainstay of cancer treatment across multiple tumors, MacroGenics believes this molecule will be the basis for combination therapy with several of its proprietary molecules.
  • MGD013. MacroGenics is developing MGD013 to provide co-blockade of two immune checkpoint molecules expressed on T cells, PD-1 and LAG-3, for potential treatment of diseases spanning a range of solid tumors as well as hematological malignancies. The Company has observed synergistic immunoregulatory activity in vitro, demonstrating that co-blockade with a PD-1 x LAG-3 DART molecule exceeds the effects achieved by combining two separate antibodies against these targets. The Company is completing IND-enabling studies and plans to submit an IND for MGD013 in the first half of 2017.
  • PD-1 x CTLA-4 Program. MacroGenics is developing a multi-specific therapeutic to address the co-blockade of PD-1 and CTLA-4, two clinically validated co-inhibitory molecules expressed on T cells.

Update on DART Clinical Programs. Across its portfolio of clinical DART programs, the Company highlighted the promising features of its DART platform, including on-target engagement, manageable safety and preliminary evidence of biological activity. These DART programs include MGD009 and the following:

  • MGD006. MacroGenics presented elements of its initial clinical experience from the ongoing Phase 1 dose escalation study of MGD006, a CD123 x CD3 DART molecule, in patients with AML (acute myeloid leukemia) or MDS (myelodysplastic syndrome). Supportive care regimens have been refined to enable significant limitations in the severity of cytokine release syndrome (CRS). In addition, the Company has characterized predictable pharmacokinetic properties of MGD006 and established biological and preliminary clinical activity in AML patients. The Company is now recruiting patients with AML or MDS in the U.S. and Europe.
  • MGD007. MacroGenics presented its initial clinical experience from the ongoing Phase 1 dose escalation study of MGD007, a gpA33 x CD3 DART, in patients with primary and metastatic colorectal cancers. In this study, gastrointestinal and constitutional symptoms have been reversible and consistent with the known target distribution of gpA33. Translational findings to date have included dose-dependent binding to CD4+ and CD8+ T cells in patients’ peripheral blood as well as histological demonstration of MGD007 binding to tumor cells in tumor biopsy specimens.
  • MGD010. The Company presented data from the fully enrolled Phase 1 study of MGD010, a CD32B x CD79B DART molecule, being developed for potential treatment of autoimmune disorders. MGD010 was well tolerated in healthy subjects in the single ascending dose study. In addition, MGD010 was shown to down-modulate B-cell function at multiple levels and preliminary data indicated that MGD010 was able to inhibit antibody response to Hepatitis A vaccination, providing clinical evidence consistent with the molecule’s expected mechanism of action.

R&D Day Webcast

To view the recorded webcast of the Company’s R&D Day event as well as download the presentation, please visit the Investor Relations section of MacroGenics’ website at http://ir.macrogenics.com/events.cfm.

About MacroGenics, Inc.

MacroGenics is a clinical-stage biopharmaceutical company focused on discovering and developing innovative monoclonal antibody-based therapeutics for the treatment of cancer, as well as autoimmune disorders and infectious diseases. The Company generates its pipeline of product candidates primarily from its proprietary suite of next-generation antibody-based technology platforms. 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, DART and TRIDENT are trademarks or registered trademarks of MacroGenics, Inc.

SOURCE: MacroGenics