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Clin Cancer Res. 2018 Mar 15;24(6):1287-1295. doi: 10.1158/1078-0432.CCR-17-2653. Epub 2018 Jan 3.

Phase I Trial of M7824 (MSB0011359C), a Bifunctional Fusion Protein Targeting PD-L1 and TGFβ, in Advanced Solid Tumors.

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Laboratory of Tumor Immunology and Biology, National Cancer Institute, NIH, Bethesda, Maryland.
Genitourinary Malignancies Branch, National Cancer Institute, NIH, Bethesda, Maryland.
Molecular Targets Core, Genetics Branch, National Cancer Institute, NIH, Bethesda, Maryland.
The Basic Science Program, Leidos Biomedical Research, Inc., Frederick, Maryland.
Office of Research Nursing, National Cancer Institute, NIH, Bethesda, Maryland.
Pharmacy Department, Clinical Center, NIH, Bethesda, Maryland.
EMD Serono, Billerica, Massachusetts.
Merck KGaA, Darmstadt, Germany.
Genitourinary Malignancies Branch, National Cancer Institute, NIH, Bethesda, Maryland.


Purpose: M7824 (MSB0011359C) is an innovative first-in-class bifunctional fusion protein composed of a mAb against programmed death ligand 1 (PD-L1) fused to a TGFβ "trap."Experimental Design: In the 3+3 dose-escalation component of this phase I study (NCT02517398), eligible patients with advanced solid tumors received M7824 at 1, 3, 10, or 20 mg/kg once every 2 weeks until confirmed progression, unacceptable toxicity, or trial withdrawal; in addition, a cohort received an initial 0.3 mg/kg dose to evaluate pharmacokinetics/pharmacodynamics, followed by 10 mg/kg dosing. The primary objective is to determine the safety and maximum tolerated dose (MTD); secondary objectives include pharmacokinetics, immunogenicity, and best overall response.Results: Nineteen heavily pretreated patients with ECOG 0-1 have received M7824. Grade ≥3 treatment-related adverse events occurred in four patients (skin infection secondary to localized bullous pemphigoid, asymptomatic lipase increase, colitis with associated anemia, and gastroparesis with hypokalemia). The MTD was not reached. M7824 saturated peripheral PD-L1 and sequestered any released plasma TGFβ1, -β2, and -β3 throughout the dosing period at >1 mg/kg. There were signs of efficacy across all dose levels, including one ongoing confirmed complete response (cervical cancer), two durable confirmed partial responses (PR; pancreatic cancer; anal cancer), one near-PR (cervical cancer), and two cases of prolonged stable disease in patients with growing disease at study entry (pancreatic cancer; carcinoid).Conclusions: M7824 has a manageable safety profile in patients with heavily pretreated advanced solid tumors. Early signs of efficacy are encouraging, and multiple expansion cohorts are ongoing in a range of tumors. Clin Cancer Res; 24(6); 1287-95. ©2018 AACR.

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