CAMBRIDGE, MA, USA I March 09, 2021 ISurface Oncology (Nasdaq: SURF), a clinical-stage immuno-oncology company developing next-generation immunotherapies that target the tumor microenvironment, announced today it has entered into a clinical trial collaboration with Merck, known as MSD outside the United States and Canada, through a subsidiary, to evaluate the safety and efficacy of combining Surface’s SRF388, an investigational antibody therapy targeting IL-27, with Merck’s KEYTRUDA® (pembrolizumab), the first anti-PD-1 therapy approved in the United States. This combination will be studied as a component of the first-in-human Phase 1 study of SRF388 and will be evaluated in patients with solid tumors, with a focus on patients with liver cancer and kidney cancer.  

“Surface is the only company with clinical-stage IL-27 research and we believe that this cytokine may play an important role in resistance to anti-PD-1 treatment,” said Rob Ross, M.D., incoming chief executive officer at Surface Oncology. “This collaboration with Merck will add an important dimension to the SRF388 clinical program and allow us to more rapidly assess its potential to deliver truly breakthrough therapies that can transform treatment for people with cancer.”

In November 2020, Surface announced that SRF388 achieved predefined criteria for advancement to the expansion stage of its ongoing Phase 1 trial. Detailed initial clinical results are expected to be reported at a medical conference in the first half of 2021.

KEYTRUDA® is a registered trademark of Merck Sharp & Dohme Corp., a subsidiary of Merck & Co., Inc., Kenilworth, NJ, USA.

About SRF388:
SRF388 is a fully human anti-IL-27 antibody designed to inhibit the activity of this immunosuppressive cytokine. Surface Oncology has identified particular tumor types, including liver and kidney cancer, where IL-27 appears to play an important role in the immunosuppressive tumor microenvironment and may contribute to resistance to treatment with checkpoint inhibitors. SRF388 targets the rate-limiting p28 subunit of IL-27, and preclinical studies have shown that treatment with SRF388 blocks the immuno-suppressive biologic effects of IL-27, resulting in immune cell activation in combination with other cancer therapies including anti-PD-1 therapy, as well as potent anti-tumor effects as a monotherapy. Furthermore, Surface Oncology has identified a potential biomarker associated with IL-27 that may be useful in helping to identify patients most likely to respond to SRF388. In November 2020, Surface announced that SRF388 was granted Orphan Drug designation and Fast Track designation for the treatment of hepatocellular carcinoma from the FDA.

About Surface Oncology:
Surface Oncology is an immuno-oncology company developing next-generation antibody therapies focused on the tumor microenvironment. Its proprietary pipeline includes two wholly owned clinical-stage programs targeting CD39 (SRF617) and IL-27 (SRF388), as well as a preclinical program focused on depleting regulatory T cells via targeting CCR8 (SRF114). In addition, Surface has two partnerships with major pharmaceutical companies: a collaboration with Novartis targeting CD73 (NZV930; Phase 1) and a collaboration with GlaxoSmithKline targeting PVRIG (SRF813; preclinical). Surface’s novel cancer immunotherapies are designed to achieve a clinically meaningful and sustained anti-tumor response and may be used alone or in combination with other therapies. For more information, please visit www.surfaceoncology.com.

SOURCE: Surface Oncology