MacroGenics Announces Presentation of MGD019 Phase 1 Data at the ESMO Virtual Congress 2020

• MGD019 well-tolerated with early signals of activity in advanced solid tumors not typically responsive to checkpoint inhibition
• Recommended Phase 2 dose established for MSS CRC, NSCLC expansion cohorts
• Presentation is available on-demand as part of the ESMO Virtual Congress 2020 

ROCKVILLE, MD, Sept. 20, 2020 (GLOBE NEWSWIRE) --

MacroGenics, Inc. (NASDAQ: MGNX), a clinical-stage biopharmaceutical company focused on discovering and developing innovative monoclonal antibody-based therapeutics for the treatment of cancer, today announced clinical data from the dose escalation portion of a Phase 1 clinical trial of MGD019. The proffered paper session titled, “A Phase 1, First-in-Human, Open-Label, Dose Escalation Study of MGD019, an Investigational Bispecific PD-1 × CTLA-4 DART Molecule in Patients with Advanced Solid Tumors,” was presented orally at the European Society for Medical Oncology (ESMO) Virtual Congress 2020 on September 20, 2020, by Dr. Manish R. Sharma, Associate Director of Clinical Research at START Midwest in Grand Rapids, Michigan.

MGD019, a bispecific PD-1 × CTLA-4 DART molecule, was designed to enhance CTLA-4 blockade on dual-expressing, tumor-infiltrating lymphocytes compared to a PD-1/CTLA-4 monoclonal antibody (mAb) combination therapy, while maintaining maximal PD-1 blockade on all PD-1-expressing cells. 

Forty-three patients were enrolled in the Phase 1 dose escalation study of MGD019 within a dose range of 0.03 – 10.0 mg/kg, administered every three weeks initially, in a population of heavily pre-treated patients representing a broad range of different types (23) of solid tumors. There were no dose-limiting toxicities (DLTs). A total of 28 patients were treated at doses ≥ 3.0 mg/kg administered every three weeks initially. MGD019 was well-tolerated in patients who received less than 10 mg/kg; the most common treatment-related adverse events over this dosing range were pruritus (23.3%), arthralgia (18.6%), fatigue (18.6%), rash (18.6%), nausea (16.3%) and infusion-related reaction (16.3%). Several Grade 3 adverse events were observed at the 10.0 mg/kg level; however, none were considered dose limiting.