On August 28, 2024 Foundation Medicine, Inc. reported a collaboration to develop Foundation Medicine’s RNA platform as a companion diagnostic for Merus N.V.’s (Nasdaq: MRUS) bispecific antibody zenocutuzumab (Zeno) to treat patients with neuregulin 1 fusion (NRG1+) cancer (Press release, Foundation Medicine, AUG 28, 2024, View Source [SID1234646176]).
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Zeno is a Biclonics that utilizes the Merus Dock & Block mechanism to inhibit the neuregulin/HER3 tumor-signaling pathway in solid tumors with NRG1 fusions (NRG1+ cancer). Through its unique mechanism of binding to HER2 and potently blocking the interaction of HER3 with its ligand NRG1, Zeno has the potential to be particularly effective against NRG1+ cancer. In preclinical studies, Zeno potently inhibits HER2/HER3 heterodimer formation thereby inhibiting oncogenic signaling pathways, leading to inhibition of tumor cell proliferation and blocking tumor cell survival.
In May the U.S. Food and Drug Administration (FDA) accepted under priority review a Biologics License Application for Zeno in patients with NRG1+ non-small cell lung (NSCLC) and NRG1+ pancreatic (PDAC) cancer. The FDA has also granted Breakthrough Therapy Designation (BTD) to Zeno for the treatment of patients with advanced unresectable or metastatic NRG1+ pancreatic cancer following progression with prior systemic therapy or who have no satisfactory alternative treatment options. Additionally, the FDA has granted BTD to Zeno for the treatment of patients with advanced unresectable or metastatic NRG1+ NSCLC, following progression with prior systemic therapy.
NRG1 gene fusions are rare and have been identified in patients with different types of solid tumors, including NSCLC, pancreatic cancer, gallbladder cancer, renal cell carcinoma, bladder cancer, ovarian cancer, breast cancer, neuroendocrine tumor, sarcoma, and colorectal cancer.1 NRG1 fusions are unique cancer drivers that create oncogenic chimeric ligands rather than the more widely described chimeric receptors (NTRK, RET, ROS1, ALK, and FGFR fusions).2
While DNA sequencing with optimized targeting can detect fusions, Foundation Medicine’s RNA platform can provide another layer of sophisticated fusion detection in 318 genes through RNA sequencing. It also has expanded capabilities for research use to offer gene expression reporting of over 1,500 genes to support biomarker discovery. Foundation Medicine is the only company with FDA-approved CDx indications for fusion biomarkers using CGP tests, including approved claims using tissue or liquid biopsy for ALK, ROS1, RET, NTRK1/2/3, and FGFR2.3
"We are excited to partner with Merus on this RNA companion diagnostic opportunity to provide fusion detection through next-generation sequencing," says Troy Schurr, Chief Biopharma Business Officer at Foundation Medicine. "We anticipate this innovative molecular information will help detect more NRG1 fusions and provide healthcare providers with important information to inform their care decisions for patients."