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Invikafusp alfa demonstrates initial durable disease control, tumor regression, and objective responses in both primary and secondary PD-1 resistant tumors including CRC and NSCLC Promising early monotherapy efficacy signal across all three major CRC subtypes with 30% ORR in the initial 10 TMB-H CRC patients treated at effective dose range further validates accelerated development plan with FDA fast track designation granted New objective response reported in PD-1 negative TMB-H NSCLC post Keytruda + chemo combo further underscore pan-tumor potential and support focused expansion strategies CAMBRIDGE, Mass., April 29, 2025 /PRNewswire/ -- Marengo Therapeutics, Inc., a clinical-stage biotechnology company pioneering novel approaches for precision immunotherapy, today announced new clinical and translational data from the ongoing STARt-001 Phase 1/2 trial of invikafusp alfa (STAR0602), presented as a clinical plenary oral session at the American Association for Cancer Research (AACR) Annual Meeting 2025. The presentation highlights strong evidence of meaningful clinical activity, robust immune activation in vivo, and a well-characterized safety profile, further supporting the momentum behind the ongoing Phase 2 study as well as the value proposition for developing invikafusp as monotherapy in PD1 resistant TMB-H cancers. "Today's data represent a major step forward for Marengo and for the field of IO to advance a new class of cancer immunotherapy: Immune Activation Inducers (IAI)," said Zhen Su, M.D., M.B.A., Chief Executive Officer of Marengo Therapeutics. "Invikafusp alfa's ability to selectively activate and expand a key T cell subset to drive meaningful anti-tumor responses across a range of PD-1 resistant tumors gives us confidence in our precision T cell activation approach. The emerging clinical signals in both colorectal and lung cancers further underscore invikafusp's pan-tumor potential and justify our focused expansion into these high-need indications." "Colorectal cancer is less sensitive to immunotherapy except in a very small percentage of MSI-H tumors. The field has seen few, if any, immunotherapy agents achieve single-agent activity in PD-1 resistant colorectal cancer," said Josep Tabernero, M.D., Director of Vall d'Hebron Institute of Oncology (VHIO). "The clinical signals observed with invikafusp alfa in both CRC and other tumor types are highly encouraging and warrant further clinical investigation to fully realize the clinical potential of this novel T cell agonist approach." Invikafusp alfa is Marengo's first-in-class dual T cell agonist, designed with a bi-specific antibody format to selectively engage and activate the Vβ6 and Vβ10 subsets of T cells in vivo, promoting durable anti-tumor immunity. Updated Findings from the STARt-001 Clinical Plenary Presentation: Clinically meaningful anti-tumor activity as monotherapy in anti-PD(L)1-resistant tumors at the recommended Phase 2 dose (RP2D) of 0.08 mg/kg: 61% disease control rate in heavily pretreated, PD-1 resistant tumors dosed at 0.08 or 0.12 mg/kg 52% tumor regression rate observed across multiple tumor types, including colorectal cancer (CRC), non-small cell lung cancer (NSCLC), cervical, squamous cell carcinoma of the head and neck (SCCHN), and melanoma Objective responses in colorectal cancer and NSCLC: 3 responders out of 10 TMB-high metastatic CRC patients (across RAS wild-type, RAS mutant, and MSI-H subtypes) 1 additional responder with 73% tumor regression out of 2 anti-PD(L)1-resistant TMB-high NSCLC patients Mechanism of Action and Translational Insights: Invikafusp promoted potent, selective expansion of peripheral CD8+ Vβ6/Vβ10 T cells, which acquired a novel "memory-like effector" phenotype in both blood and tumor tissue Expanded and activated Vβ T cells in post treatment tumor tissues consistent with enhanced anti-tumor function Safety Profile: Consistent with a selective T cell activation mechanism Adverse events were generally transient and manageable with supportive care Based on these early clinical and preclinical findings, the U.S. Food and Drug Administration has granted Fast Track Designation to invikafusp alfa for the treatment of patients with TMB-high colorectal cancer. The Phase 2 portion of the STARt-002 trial is actively enrolling patients across multiple tumor types, including TMB-H metastatic colorectal cancer, MSI-H and TMB-H tissue-agnostic solid tumors. About Marengo Therapeutics Marengo Therapeutics, Inc., a clinical-stage biotech company, develops novel TCR-targeting antibodies that selectively modulate common and disease-specific T cell subsets of the germline TCR repertoire to provide lifelong protection against cancer and autoimmune diseases. With a passionate team of dedicated scientists experienced in immunology and oncology, and three proprietary platforms: Selective T Cell Activation Repertoire (STAR), Trispecific T Cell Engager (Tri-STAR) and T cell Depletor (MSTAR), Marengo is working to selectively target the right T cells in the right patients to create a world in which everyone's immune system can defeat cancer and autoimmune diseases. To learn more, visit marengotx.com. About the STAR™ Platform Marengo's STAR™ Platform is a multi-specific antibody-fusion platform derived from Marengo's proprietary library of antibodies targeting germline-encoded variable Vβ regions of the TCR fused to different T cell co-stimulatory moieties. Combining a novel non-clonal mode of TCR activation with a T cell co-stimulator in the same molecule promotes a distinct mechanism of action that promotes durable anti-tumor Vβ T cell responses. About Invikafusp alfa (STAR0602) Invikafusp alfa (STAR0602) is the lead candidate from Marengo's STAR™ platform. It is designed to selectively activate a common Vβ T cell subset found in all cancers by combining a non-clonal mode of TCR activation with a T cell co-stimulatory signal in a single molecule. This innovative approach promotes the expansion of clonally diverse, effector memory Vβ T cells, enhancing anti-tumor immunity and enabling durable tumor clearance. Extensive preclinical studies demonstrate STAR0602's potent anti-tumor activity in both mouse and human ex vivo models via a novel mechanism of action. About the STARt-001 Clinical Study STARt-001 is a Phase 1/2 clinical trial evaluating the safety, tolerability, and preliminary efficacy of invikafusp alfa as a monotherapy in biomarker-selected patients with advanced antigen-rich solid tumors, including PD-1 refractory and rare tumor types. The trial consists of two parts: Phase 1 dose escalation and Phase 2 dose expansion. For more information, visit clinicaltrials.gov (Identifier: NCT05592626). Patients interested in participating in this study at the National Cancer Institute (NCI) can contact NCI's toll-free number: 1-800-4-CANCER (1-800-422-6237) (TTY: 1-800-332-8615), visit the website at , or email [email protected]. Marengo Contacts: Media Peg Rusconi | [email protected] Investors Svetlana Makhni | [email protected] SOURCE Marengo Therapeutics WANT YOUR COMPANY'S NEWS FEATURED ON PRNEWSWIRE.COM? 440k+ Newsrooms & Influencers 9k+ Digital Media Outlets 270k+ Journalists Opted In GET STARTED

Initial disease control rate of 67%, tumor regression rate of 44% and preliminary objective response rate of 22% were observed in TMB-H patients at the optimal biological dose range Invikafusp alfa (STAR0602) demonstrates pan-tumor selective Vβ T cell expansion in vivo across 18 different solid tumor types Data highlight promising anti-tumor activity as single agent in heavily pretreated anti-PD(L)1 resistant tumors including both primary and secondary resistant patients CAMBRIDGE, Mass., April 25, 2025 /PRNewswire/ -- Marengo Therapeutics, Inc., a clinical-stage biotechnology company pioneering novel approaches for precision immunotherapy, today announced an upcoming clinical plenary oral presentation at the American Association for Cancer Research (AACR) Annual Meeting 2025. The presentation will report updated clinical and translational findings from the ongoing Phase 1/2 trial (STARt-001) evaluating invikafusp alfa (STAR0602) in patients with anti-PD(L)1-resistant, antigen-rich solid tumors. The results highlight clinical pharmacology, selective immune activation, and RP2D selection in addition to demonstrating clinically meaningful anti-tumor activity and a well-characterized safety profile. The data also further support the advancement of the lead asset into Phase 2 development and confirm clinical efficacy. "These encouraging data represent the first clinical proof of our precision T cell agonist approach to overcome anti-PD(L)1-resistant cancer, a therapeutic area with significant unmet need. Importantly, invikafusp monotherapy not only selectively engaged and expanded a key T cell subset in immunotherapy-resistant tumors, but also reinvigorated anti-tumor responses," said Ke Liu, M.D. Ph.D., Chief Development Officer of Marengo Therapeutics. "Based on the initial disease control and tumor regression rates observed, invikafusp has the potential to offer a promising new class of immunotherapy for patients who have exhausted checkpoint inhibitor therapy options." "The initial clinical activity of invikafusp monotherapy in PD-1 resistant tumors is novel and important as a new approach to immunotherapy," said Bruce A. Chabner, M.D., Clinical Director Emeritus at Massachusetts General Hospital. "The ability of invikafusp to activate a specific subset of T cells in heavily pretreated cancer patients and achieve objective responses in tumors that have failed PD-1 inhibitors is clinically meaningful. These results may mark the beginning of a new class of novel T cell agonists in treating checkpoint resistant cancers with precision immune activation." Invikafusp alfa is Marengo's first-in-class, dual T cell agonist with a bi-specific antibody design to selectively activate the Vβ6 and Vβ10 subsets of T cells in vivo. Key Findings from the Abstract (CT205): Initial Clinical Activity (TMB-H subgroup at optimal biologic dose): Six of the initial nine efficacy evaluable patients (67%) achieved disease control (2 confirmed partial responses (cPRs) and 4 with stable disease) The cPRs were in MSS colorectal cancer with one response lasting ~12 months Plenary oral presentation to include updated clinical results from initial data cut and additional patients Clinical Pharmacology and Recommended Phase 2 Dose (RP2D): RP2D was determined as 0.08 mg/kg Q2W, selected based on pharmacokinetics, pharmacodynamics, safety, and activity Dose-dependent, selective expansion of peripheral CD8+ Vβ6/Vβ10 T cells, with ~600% average peak expansion at RP2D Expanded Vβ T cells exhibited a memory phenotype and expressed cytotoxic effector molecules Soluble markers of T cell activation (e.g., IFN-γ, sCD25) increased post-dosing; inflammatory cytokines (e.g., TNF-α, IL-6) remained limited below RP2D Based on initial clinical and preclinical results, the U.S. Food and Drug Administration granted Fast Track Designation to invikafusp alfa for the treatment of patients with TMB-high colorectal cancer. The STARt-001 Phase 2 portion of the trial is ongoing and actively enrolling, focused on expanding into other antigen-rich tumors, including MSI-H and TMB-H tissue agnostic solid tumors. Presentation Details Title: Updated clinical results, recommended Phase 2 dose (RP2D) determination and translational study results for START-001: a Phase 1/2 trial of invikafusp alfa, a first-in-class TCR β chain-targeted bispecific antibody in patients with anti-PD(L)1-resistant, antigen-rich solid tumors Abstract Number: CT205 (Late-breaking) Session Title: Clinical Trials Plenary: Biologics and T-cell Engagers Session Date and Time: Tuesday, April 29, 2025, 10:15 AM – 12:15 PM CT Presenter: Ryan J. Sullivan, M.D., Massachusetts General Hospital About Marengo Therapeutics Marengo Therapeutics, Inc., a clinical-stage biotech company, develops novel TCR-targeting antibodies that selectively modulate common and disease-specific T cell subsets of the germline TCR repertoire to provide lifelong protection against cancer and autoimmune diseases. With a passionate team of dedicated scientists experienced in immunology and oncology, and three proprietary platforms: Selective T Cell Activation Repertoire (STAR), Trispecific T Cell Engager (Tri-STAR) and T cell Depletor (MSTAR), Marengo is working to selectively target the right T cells in the right patients to create a world in which everyone's immune system can defeat cancer and autoimmune diseases. To learn more, visit marengotx.com. About the STAR™ Platform Marengo's STAR™ Platform is a multi-specific antibody-fusion platform derived from Marengo's proprietary library of antibodies targeting germline-encoded variable Vβ regions of the TCR fused to different T cell co-stimulatory moieties. Combining a novel non-clonal mode of TCR activation with a T cell co-stimulator in the same molecule promotes a distinct mechanism of action that promotes durable anti-tumor Vβ T cell responses. About Invikafusp alfa (STAR0602) Invikafusp alfa (STAR0602) is the lead candidate from Marengo's STAR™ platform. It is designed to selectively activate a common Vβ T cell subset found in all cancers by combining a non-clonal mode of TCR activation with a T cell co-stimulatory signal in a single molecule. This innovative approach promotes the expansion of clonally diverse, effector memory Vβ T cells, enhancing anti-tumor immunity and enabling durable tumor clearance. Extensive preclinical studies demonstrate STAR0602's potent anti-tumor activity in both mouse and human ex vivo models via a novel mechanism of action. About the STARt-001 Clinical Study STARt-001 is a Phase 1/2 clinical trial evaluating the safety, tolerability, and preliminary efficacy of invikafusp alfa as a monotherapy in biomarker-selected patients with advanced antigen-rich solid tumors, including PD-1 refractory and rare tumor types. The trial consists of two parts: Phase 1 dose escalation and Phase 2 dose expansion. For more information, visit clinicaltrials.gov (Identifier: NCT05592626). Patients interested in participating in this study at the National Cancer Institute (NCI) can contact NCI's toll-free number: 1-800-4-CANCER (1-800-422-6237) (TTY: 1-800-332-8615), visit the website at , or email [email protected]. Marengo Contacts: Media Peg Rusconi | [email protected] Investors Svetlana Makhni | [email protected] SOURCE Marengo Therapeutics WANT YOUR COMPANY'S NEWS FEATURED ON PRNEWSWIRE.COM? 440k+ Newsrooms & Influencers 9k+ Digital Media Outlets 270k+ Journalists Opted In GET STARTED