Merus Announces First Patient Dosed in LiGeR-HN1, a Phase 3 Trial Evaluating Petosemtamab in Combination with Pembrolizumab in 1L r/m HNSCC

MRUS 09.30.2024

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UTRECHT, The NetherlandsandCAMBRIDGE, Mass.,Sept. 30, 2024(GLOBE NEWSWIRE) --Merus N.V.(Nasdaq: MRUS) (Merus, the Company, we, or our), a clinical-stage oncology company developing innovative, full-length multispecific antibodies (Biclonics®and Triclonics®), today announced that the first patient has been dosed in the Company’s phase 3 trial evaluating the efficacy and safety of petosemtamab, a Biclonics®targeting EGFR and LGR5, in combination with pembrolizumab, compared to pembrolizumab as first line (1L) therapy for patients with PD-L1+ recurrent/metastatic head and neck squamous cell carcinoma (r/m HNSCC), referred to as the LiGeR-HN1 trial.

Merus has confirmed through feedback with theU.S. Food and Drug Administration(FDA) that petosemtamab 1500 mg every two weeks is appropriate for further development in HNSCC as monotherapy, and in combination with pembrolizumab.

“Based on our strong phase 2 clinical data reported previously for petosemtamab in HNSCC both as monotherapy and in combination with pembrolizumab, I continue to be confident that petosemtamab has the opportunity to become a new standard of care across r/m HNSCC and potentially beyond,” saidBill Lundberg, M.D., President, Chief Executive Officer of Merus. “Our recently announced alignment with the FDA on phase 3 dose, and excellent execution to date has allowed us to promptly initiate our registration trials in 1L and 2/3L HNSCC.”

More details of the trial can be found atclinicaltrials.gov.

About LiGeR-HN1LiGeR-HN1, a phase 3 trial, will evaluate the safety and efficacy of petosemtamab in combination with pembrolizumab, compared to pembrolizumab in 1L PD-L1+ r/m HNSCC patients. The trial is open to adult patients eligible to receive pembrolizumab as 1L monotherapy with tumors expressing PD-L1, CPS ≥1. The primary endpoints are overall response rate as assessed by BICR based on RECIST v1.1 and overall survival. Secondary endpoints are duration of response and progression free survival. Merus plans to enroll approximately 500 patients in the trial.

About PetosemtamabPetosemtamab, or MCLA-158, is a Biclonics®low-fucose human full-length IgG1 antibody targeting the epidermal growth factor receptor (EGFR) and the leucine-rich repeat containing G-protein-coupled receptor 5 (LGR5). Petosemtamab is designed to exhibit three independent mechanisms of action including inhibition of EGFR-dependent signaling, LGR5 binding leading to EGFR internalization and degradation in cancer cells, and enhanced antibody-dependent cell-mediated cytotoxicity (ADCC) and antibody-dependent cellular phagocytosis (ADCP) activity.

About Head and Neck CancerHead and neck squamous cell carcinoma (HNSCC) describes a group of cancers that develop in the squamous cells that line the mucosal surfaces of the mouth, throat, and larynx. These cancers begin when healthy cells change and grow in an unchecked manner, ultimately forming tumors. HNSCC is generally associated with tobacco consumption, alcohol use and/or HPV infections, depending on where they develop geographically. HNSCC is the sixth most common cancer worldwide and it is estimated that there were more than 930,000 new cases and over 465,000 deaths from HNSCC globally in 2020.1The incidence of HNSCC continues to rise and is anticipated to increase by 30% to more than 1 million new cases annually by 2030.2HNSCC is a serious and life-threatening disease with poor prognosis despite currently available standard of care therapies.1Sung et al. CA Cancer J Clin, 71:209-49, 2021;2Johnson, D.E., Burtness, B., Leemans, C.R. et al. Head and neck squamouscellcarcinoma. Nat Rev Dis Primers 6, 92 (2020)

AboutMerus N.V.Merusis a clinical-stage oncology company developing innovative full-length human bispecific and trispecific antibody therapeutics, referred to asMulticlonics®.Multiclonics®are manufactured using industry standard processes and have been observed in preclinical and clinical studies to have several of the same features of conventional human monoclonal antibodies, such as long half-life and low immunogenicity. For additional information, please visit Merus’website,X, andLinkedIn.

Forward-Looking Statements

This press release contains forward-looking statements within the meaning of the Private Securities Litigation Reform Act of 1995. All statements contained in this press release that do not relate to matters of historical fact should be considered forward-looking statements, including without limitation, statements regarding the evaluation of petosemtamab in patients with HNSCC in monotherapy and in combination with pembrolizumab, our design and execution of the LiGeR-HN1 trial, our belief, through feedback with theU.S.FDA, that petosemtamab 1500 mg every two weeks is appropriate for further development in HNSCC as monotherapy, and in combination with pembrolizumab; our belief that petosemtamab has the potential to become a new standard of care across r/m HNSCC; and our belief in alignment with the FDA on dose; and that the incidence of HNSCC continues to rise and is anticipated to increase by 30% to more than 1 million new cases annually by 2030. These forward-looking statements are based on management’s current expectations. These statements are neither promises nor guarantees, but involve known and unknown risks, uncertainties and other important factors that may cause our actual results, performance or achievements to be materially different from any future results, performance or achievements expressed or implied by the forward-looking statements, including, but not limited to, the following: our need for additional funding, which may not be available and which may require us to restrict our operations or require us to relinquish rights to our technologies or antibody candidates; potential delays in regulatory approval, which would impact our ability to commercialize our product candidates and affect our ability to generate revenue; the lengthy and expensive process of clinical drug development, which has an uncertain outcome; the unpredictable nature of our early stage development efforts for marketable drugs; potential delays in enrollment of patients, which could affect the receipt of necessary regulatory approvals; our reliance on third parties to conduct our clinical trials and the potential for those third parties to not perform satisfactorily; impacts of the volatility in the global economy, including global instability, including the ongoing conflicts inEuropeand theMiddle East; we may not identify suitable Biclonics® or bispecific antibody candidates under our collaborations or our collaborators may fail to perform adequately under our collaborations; our reliance on third parties to manufacture our product candidates, which may delay, prevent or impair our development and commercialization efforts; protection of our proprietary technology; our patents may be found invalid, unenforceable, circumvented by competitors and our patent applications may be found not to comply with the rules and regulations of patentability; we may fail to prevail in potential lawsuits for infringement of third-party intellectual property; and our registered or unregistered trademarks or trade names may be challenged, infringed, circumvented or declared generic or determined to be infringing on other marks. These and other important factors discussed under the caption “Risk Factors” in our Quarterly Report on Form 10-Q for the period endedJune 30, 2024, filed with theSecurities and Exchange Commission, orSEC, onAugust 1, 2024, and our other reports filed with theSEC, could cause actual results to differ materially from those indicated by the forward-looking statements made in this press release. Any such forward-looking statements represent management’s estimates as of the date of this press release. While we may elect to update such forward-looking statements at some point in the future, we disclaim any obligation to do so, even if subsequent events cause our views to change, except as required under applicable law. These forward-looking statements should not be relied upon as representing our views as of any date subsequent to the date of this press release.

Multiclonics®, Biclonics®and Triclonics®are registered trademarks ofMerus N.V.

Investor and Media Inquiries:Sherri SpearMerus N.V.SVP Investor Relations and Strategic Communications617-821-3246s.spear@merus.nlKathleen FarrenMerus N.V.Assoc. Director IR/Corp Comms617-230-4165k.farren@merus.nl

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Source: Merus N.V.

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