Scientists Discovered The 'Missing' Amino Acid That Triggered 30% Weight Loss in Just One Week
According to the World Health Organization, adult obesity has more than doubled since the 1990s, while adolescent obesity has quadrupled. Despite various diet strategies like low-carb and low-fat plans, GLP-1 medications, and different exercise routines aimed at reducing obesity, the numbers continue to rise with no clear end in sight. However, a new study suggests there may be a way to lose a meaningful amount of weight in as little as one week.
The study, published in Nature, found that mice that were genetically modified to stop producing a specific amino acid (cysteine) while being fed a cysteine-free diet, lost 30 percent of their body weight in just one week.
Cysteine is a sulfur-containing amino acid important for protein synthesis and various metabolic processes within the body. Researchers believe that when cysteine isn't present, our body will begin to break down fat stores.
'Our surprising findings reveal that low cysteine levels triggered rapid fat loss in our study mice by activating a network of interconnected biological pathways,' co-senior study author Evgeny A. Nudler, PhD, professor in the Department of Biochemistry and Molecular Pharmacology at NYU Grossman School of Medicine, said in a statement.
According to the authors, the study is the first to show that removing cysteine causes more weight loss than removing any other essential amino acid. Because cysteine is vital for oxidative phosphorylation, without it, the body can't use sugar molecules efficiently and burns fat instead.It was noted that cysteine depletion can also trigger stress responses that increase hormones that suppress appetite and break down fat-making enzymes. This combination prevents fat storage and leads to weight loss.
'While driving weight loss in the clinic remains a key future mission, we are most excited for the moment about the profound, fundamental aspects of metabolism revealed in this study,' added Dr. Nudler.
Researchers note, though, that this is not a foolproof way to induce weight loss in humans, especially given that cysteine is found in a majority of foods. To achieve a diet completely free of cysteine, patients would need to consume a specially formulated diet. They also added that because cysteine is involved in numerous cellular pathways, removing it could increase the concentration of everyday toxins.
'Given that achieving maximum cysteine deprivation weight loss in the mice was dependent on both diet and deletion of the gene, moving forward we can now restore cysteine production genetically in specific cells or tissues and determine the role of each in the dramatic weight loss we observed,' said co-senior author Dan R. Littman, MD, PhD. 'We hope in the future to hijack parts of this process to induce a similar weight loss in humans but without completely removing cysteine.'
Scientists Discovered The 'Missing' Amino Acid That Triggered 30% Weight Loss in Just One Week first appeared on Men's Journal on May 27, 2025
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Median duration of cranial nerve palsies was 70 days (range: 1 to 262 days) in all patients including those with ongoing neurologic events at the time of death or data cut-off. Cranial nerve palsies occurred in 9% of patients in CARTITUDE-4 (1% Grade 3 to 4) and in 3% of patients in CARTITUDE-1 (1% Grade 3 to 4). The most frequent cranial nerve affected was the 7th cranial nerve. Additionally, cranial nerves III, V, and VI have been reported to be affected. Monitor patients for signs and symptoms of cranial nerve palsies. Consider management with systemic corticosteroids, depending on the severity and progression of signs and symptoms. HEMOPHAGOCYTIC LYMPHOHISTIOCYTOSIS (HLH)/MACROPHAGE ACTIVATION SYNDROME (MAS): Among patients receiving CARVYKTI® in the CARTITUDE-1 & 4 studies, HLH/MAS occurred in 1% (3/285) of patients. All events of HLH/MAS had onset within 99 days of receiving CARVYKTI®, with a median onset of 10 days (range: 8 to 99 days) and all occurred in the setting of ongoing or worsening CRS. The manifestations of HLH/MAS included hyperferritinemia, hypotension, hypoxia with diffuse alveolar damage, coagulopathy and hemorrhage, cytopenia, and multi-organ dysfunction, including renal dysfunction and respiratory failure. Patients who develop HLH/MAS have an increased risk of severe bleeding. Monitor hematologic parameters in patients with HLH/MAS and transfuse per institutional guidelines. Fatal cases of HLH/MAS occurred following treatment with CARVYKTI®. HLH is a life-threatening condition with a high mortality rate if not recognized and treated early. Treatment of HLH/MAS should be administered per institutional standards. 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Seventy-seven percent (219/285) of patients had one, two, or three or more recurrences of Grade 3 or 4 cytopenias after initial recovery of Grade 3 or 4 cytopenia. Sixteen and 25 patients had Grade 3 or 4 neutropenia and thrombocytopenia, respectively, at the time of death. Monitor blood counts prior to and after CARVYKTI® infusion. Manage cytopenias with growth factors and blood product transfusion support according to local institutional guidelines. INFECTIONS: CARVYKTI® should not be administered to patients with active infection or inflammatory disorders. Severe, life-threatening, or fatal infections, occurred in patients after CARVYKTI® infusion. Among patients receiving CARVYKTI® in the CARTITUDE-1 & 4 studies, infections occurred in 57% (163/285), including ≥Grade 3 in 24% (69/285) of patients. Grade 3 or 4 infections with an unspecified pathogen occurred in 12%, viral infections in 6%, bacterial infections in 5%, and fungal infections in 1% of patients. Overall, 5% (13/285) of patients had Grade 5 infections, 2.5% of which were due to COVID-19. Patients treated with CARVYKTI® had an increased rate of fatal COVID-19 infections compared to the standard therapy arm. Monitor patients for signs and symptoms of infection before and after CARVYKTI® infusion and treat patients appropriately. Administer prophylactic, pre-emptive, and/or therapeutic antimicrobials according to the standard institutional guidelines. Febrile neutropenia was observed in 5% of patients after CARVYKTI® infusion and may be concurrent with CRS. In the event of febrile neutropenia, evaluate for infection and manage with broad-spectrum antibiotics, fluids, and other supportive care, as medically indicated. Counsel patients on the importance of prevention measures. Follow institutional guidelines for the vaccination and management of immunocompromised patients with COVID-19. Viral Reactivation: Hepatitis B virus (HBV) reactivation, in some cases resulting in fulminant hepatitis, hepatic failure, and death, can occur in patients with hypogammaglobulinemia. Perform screening for Cytomegalovirus (CMV), HBV, hepatitis C virus (HCV), human immunodeficiency virus (HIV), or any other infectious agents if clinically indicated in accordance with clinical guidelines before collection of cells for manufacturing. Consider antiviral therapy to prevent viral reactivation per local institutional guidelines/clinical practice. HYPOGAMMAGLOBULINEMIA: can occur in patients receiving treatment with CARVYKTI®. Among patients receiving CARVYKTI® in the CARTITUDE-1 & 4 studies, hypogammaglobulinemia adverse event was reported in 36% (102/285) of patients; laboratory IgG levels fell below 500mg/dl after infusion in 93% (265/285) of patients. Hypogammaglobulinemia either as an adverse reaction or laboratory IgG level below 500mg/dl, after infusion occurred in 94% (267/285) of patients treated. Fifty-six percent (161/285) of patients received intravenous immunoglobulin (IVIG) post CARVYKTI® for either an adverse reaction or prophylaxis. Monitor immunoglobulin levels after treatment with CARVYKTI® and administer IVIG for IgG <400 mg/dL. Manage per local institutional guidelines, including infection precautions and antibiotic or antiviral prophylaxis. Use of Live Vaccines: The safety of immunization with live viral vaccines during or following CARVYKTI® treatment has not been studied. Vaccination with live virus vaccines is not recommended for at least 6 weeks prior to the start of lymphodepleting chemotherapy, during CARVYKTI® treatment, and until immune recovery following treatment with CARVYKTI®. HYPERSENSITIVITY REACTIONS occurred following treatment with CARVYKTI®. Among patients receiving CARVYKTI® in the CARTITUDE-1 & 4 studies, hypersensitivity reactions occurred in 5% (13/285), all of which were ≤ Grade 2. Manifestations of hypersensitivity reactions included flushing, chest discomfort, tachycardia, wheezing, tremor, burning sensation, non-cardiac chest pain, and pyrexia. Serious hypersensitivity reactions, including anaphylaxis, may be due to the dimethyl sulfoxide (DMSO) in CARVYKTI®. Patients should be carefully monitored for 2 hours after infusion for signs and symptoms of severe reaction. Treat promptly and manage patients appropriately according to the severity of the hypersensitivity reaction. SECONDARY MALIGNANCIES: Patients treated with CARVYKTI® may develop secondary malignancies. Among patients receiving CARVYKTI® in the CARTITUDE-1 & 4 studies, myeloid neoplasms occurred in 5% (13/285) of patients (9 cases of myelodysplastic syndrome, 3 cases of acute myeloid leukemia, and 1 case of myelodysplastic syndrome followed by acute myeloid leukemia). The median time to onset of myeloid neoplasms was 447 days (range: 56 to 870 days) after treatment with CARVYKTI®. Ten of these 13 patients died following the development of myeloid neoplasms; 2 of the 13 cases of myeloid neoplasm occurred after initiation of subsequent antimyeloma therapy. Cases of myelodysplastic syndrome and acute myeloid leukemia have also been reported in the post-marketing setting. T-cell malignancies have occurred following treatment of hematologic malignancies with BCMA- and CD19-directed genetically modified autologous T-cell immunotherapies, including CARVYKTI®. Mature T-cell malignancies, including CAR-positive tumors, may present as soon as weeks following infusions and may include fatal outcomes. Monitor life-long for secondary malignancies. In the event that a secondary malignancy occurs, contact Janssen Biotech, Inc. at 1-800-526-7736 for reporting and to obtain instructions on collection of patient samples. EFFECTS ON ABILITY TO DRIVE AND USE MACHINES: Due to the potential for neurologic events, including altered mental status, seizures, neurocognitive decline, or neuropathy, patients receiving CARVYKTI® are at risk for altered or decreased consciousness or coordination in the 8 weeks following CARVYKTI® infusion. Advise patients to refrain from driving and engaging in hazardous occupations or activities, such as operating heavy or potentially dangerous machinery during this initial period, and in the event of new onset of any neurologic REACTIONS The most common nonlaboratory adverse reactions (incidence greater than 20%) are pyrexia, cytokine release syndrome, hypogammaglobulinemia, hypotension, musculoskeletal pain, fatigue, infections-pathogen unspecified, cough, chills, diarrhea, nausea, encephalopathy, decreased appetite, upper respiratory tract infection, headache, tachycardia, dizziness, dyspnea, edema, viral infections, coagulopathy, constipation, and vomiting. The most common Grade 3 or 4 laboratory adverse reactions (incidence greater than or equal to 50%) include lymphopenia, neutropenia, white blood cell decreased, thrombocytopenia, and anemia. Please read full Prescribing Information, including Boxed Warning, for CARVYKTI®. ABOUT CARVYKTI® (CILTACABTAGENE AUTOLEUCEL; CILTA-CEL) Ciltacabtagene autoleucel is a BCMA-directed, genetically modified autologous T-cell immunotherapy, which involves reprogramming a patient's own T-cells with a transgene encoding a chimeric antigen receptor (CAR) that identifies and eliminates cells that express BCMA. The cilta-cel CAR protein features two BCMA-targeting single domain antibodies designed to confer high avidity against human BCMA. Upon binding to BCMA-expressing cells, the CAR promotes T-cell activation, expansion, and elimination of target cells.1 In December 2017, Legend Biotech entered into an exclusive worldwide license and collaboration agreement with Janssen Biotech, Inc. (Janssen), a Johnson & Johnson company, to develop and commercialize cilta-cel. In February 2022, cilta-cel was approved by the U.S. Food and Drug Administration (FDA) under the brand name CARVYKTI® for the treatment of adults with relapsed or refractory multiple myeloma. In April 2024, cilta-cel was approved for the second-line treatment of patients with relapsed/refractory myeloma who have received at least one prior line of therapy including a proteasome inhibitor, an immunomodulatory agent, and are refractory to lenalidomide. In May 2022, the European Commission (EC) granted conditional marketing authorization of CARVYKTI® for the treatment of adults with relapsed and refractory multiple myeloma. In September 2022, Japan's Ministry of Health, Labour and Welfare (MHLW) approved CARVYKTI®. Cilta-cel was granted Breakthrough Therapy Designation in the U.S. in December 2019 and in China in August 2020. In addition, cilta-cel received a PRIority MEdicines (PRIME) designation from the European Commission in April 2019. Cilta-cel also received Orphan Drug Designation from the U.S. FDA in February 2019, from the European Commission in February 2020, and from the Pharmaceuticals and Medicinal Devices Agency (PMDA) in Japan in June 2020. In March 2022, the European Medicines Agency's Committee for Orphan Medicinal Products recommended by consensus that the orphan designation for cilta-cel be maintained on the basis of clinical data demonstrating improved and sustained complete response rates following treatment. ABOUT CARTITUDE-1 CARTITUDE-1 (NCT03548207) is a Phase 1b/2, open-label, multicenter study evaluating the safety and efficacy of cilta-cel in adults with relapsed and/or refractory with multiple myeloma who have received at least 3 prior lines of therapy or are double refractory to a PI and IMiD, received a PI, an IMiD, and anti-CD38 antibody and documented disease progression within 12 months of starting the most recent therapy. The primary objective of the Phase 1b portion of the study was to characterize the safety and confirm the recommended Phase 2 dose of cilta-cel, informed by the first-in-human study with LCAR-B38M CAR-T cells (LEGEND-2). The Phase 2 portion further evaluated the efficacy of cilta-cel with overall response rate as the primary endpoint.2 ABOUT CARTITUDE-4 CARTITUDE-4 (NCT04181827) is an ongoing, international, randomized, open-label Phase 3 study evaluating the efficacy and safety of cilta-cel versus pomalidomide, bortezomib and dexamethasone (PVd) or daratumumab, pomalidomide and dexamethasone (DPd) in adult patients with relapsed and lenalidomide-refractory multiple myeloma who received one to three prior lines of therapy, including a PI and an IMiD.3 ABOUT LB1908 NCT05539430 is a Phase 1, open label, dose escalation, multicenter study to evaluate Claudin 18.2-targeting CAR-T cells (LB1908) in adult patients with unresectable, locally advanced or metastatic gastric, gastroesophageal junction, esophageal, or pancreatic adenocarcinoma.4 ABOUT LB2102 NCT05680922 is a Phase 1, first-in-human, open-label, multicenter, dose escalation and expansion study of DLL3-targeted chimeric antigen receptor T-cells (LB2102) in patients with extensive stage small cell lung cancer or large cell neuroendocrine lung cancer.5 ABOUT MULTIPLE MYELOMA Multiple myeloma is an incurable blood cancer that starts in the bone marrow and is characterized by an excessive proliferation of plasma cells.6 In 2024, it is estimated that more than 35,000 people will be diagnosed with multiple myeloma, and more than 12,000 people will die from the disease in the U.S.7 While some patients with multiple myeloma initially have no symptoms, most patients are diagnosed due to symptoms that can include bone problems, low blood counts, calcium elevation, kidney problems or infections.8 ABOUT GASTRIC, ESOPHAGEAL AND PANCREATIC CANCERS Stomach, esophageal and pancreatic cancers affect the tissue or glands lining these organs. They are often diagnosed when the diseases have progressed to advanced stages. In the U.S., there are an estimated 123,920 people living with stomach cancer and 49,084 living with esophageal cancers.9,10 An estimated 89,248 people in the U.S. live with pancreatic cancer. While all three cancers are treatable, the five-year survival rate is just 32% for gastric cancer; 20% for esophageal cancer; and 11.5% for pancreatic cancer, with definitive treatment at all stages of progression.11,12,13 ABOUT SMALL CELL LUNG CANCER Lung cancer is a leading cause of cancer deaths, contributing to 25 percent of all cancer-related fatalities annually in the United States.14 Small cell lung cancer (SCLC) is the most aggressive, and accounts for roughly 10-15 percent of lung cancer cases in the United States.15,16 An estimated 30,000 to 35,000 people are newly diagnosed with the disease each year.16 This cancer becomes more difficult to treat once it has spread and becomes extensive stage SCLC. Approximately 60 to 70 percent of SCLC patients are diagnosed with metastatic SCLC.15,17 ABOUT LEGEND BIOTECH With over 2,600 employees, Legend Biotech is the largest standalone cell therapy company and a pioneer in treatments that change cancer care forever. The company is at the forefront of the CAR-T cell therapy revolution with CARVYKTI®, a one-time treatment for relapsed or refractory multiple myeloma, which it develops and markets with collaborator Johnson & Johnson. Centered in the US, Legend is building an end-to-end cell therapy company by expanding its leadership to maximize CARVYKTI's patient access and therapeutic potential. From this platform, the company plans to drive future innovation across its pipeline of cutting-edge cell therapy modalities. Learn more at and follow us on X (formerly Twitter) and LinkedIn. CAUTIONARY NOTE REGARDING FORWARD-LOOKING STATEMENTS Statements in this press release about future expectations, plans, and prospects, as well as any other statements regarding matters that are not historical facts, constitute 'forward-looking statements' within the meaning of The Private Securities Litigation Reform Act of 1995. These statements include, but are not limited to, statements relating to Legend Biotech's strategies and objectives; statements relating to CARVYKTI®, including Legend Biotech's expectations for CARVYKTI® and its therapeutic potential; statements related to the potential results from ongoing studies in the CARTITUDE clinical development program; and the potential benefits of Legend Biotech's product candidates. The words 'anticipate,' 'believe,' 'continue,' 'could,' 'estimate,' 'expect,' 'intend,' 'may,' 'plan,' 'potential,' 'predict,' 'project,' 'should,' 'target,' 'will,' 'would' and similar expressions are intended to identify forward-looking statements, although not all forward-looking statements contain these identifying words. Actual results may differ materially from those indicated by such forward-looking statements as a result of various important factors. Legend Biotech's expectations could be affected by, among other things, uncertainties involved in the development of new pharmaceutical products; unexpected clinical trial results, including as a result of additional analysis of existing clinical data or unexpected new clinical data; unexpected regulatory actions or delays, including requests for additional safety and/or efficacy data or analysis of data, or government regulation generally; unexpected delays as a result of actions undertaken, or failures to act, by our third party partners; uncertainties arising from challenges to Legend Biotech's patent or other proprietary intellectual property protection, including the uncertainties involved in the U.S. litigation process; government, industry, and general product pricing and other political pressures; as well as the other factors discussed in the 'Risk Factors' section of Legend Biotech's Annual Report on Form 20-F filed with the Securities and Exchange Commission on March 11, 2025. Should one or more of these risks or uncertainties materialize, or should underlying assumptions prove incorrect, actual results may vary materially from those described in this press release as anticipated, believed, estimated or expected. Any forward-looking statements contained in this press release speak only as of the date of this press release. Legend Biotech specifically disclaims any obligation to update any forward-looking statement, whether as a result of new information, future events or otherwise. ‡ Sundar Jagannath, M.D., Network Director, Multiple Myeloma Center of Excellence for Multiple Myeloma at The Tisch Cancer Institute, Icahn School of Medicine at Mount Sinai, New York, has provided consulting, advisory, and speaking services to Legend Biotech; has not been paid for any media work. INVESTOR CONTACT: Jessie YeungTel: (732) 956-8271 PRESS CONTACT: MaryAnn OndishTel: (914) 552-4625media@ REFERENCES _____________________ 1 CARVYKTI™ Prescribing Information. Horsham, PA: Janssen Biotech, Inc.2 A Study of JNJ-68284528, a Chimeric Antigen Receptor T Cell (CAR-T) Therapy Directed Against B-Cell Maturation Antigen (BCMA) in Participants With Relapsed or Refractory Multiple Myeloma (CARTITUDE-1). Available at: Accessed October 2022.3 A Study Comparing JNJ-68284528, a CAR-T Therapy Directed Against B-cell Maturation Antigen (BCMA), Versus Pomalidomide, Bortezomib and Dexamethasone (PVd) or Daratumumab, Pomalidomide and Dexamethasone (DPd) in Participants With Relapsed and Lenalidomide-Refractory Multiple Myeloma (CARTITUDE-4). Accessed March 2024.4 Claudin 18.2-Targeted Chimeric Antigen Receptor T-cells in Subjects With Unresectable, Locally Advanced, or Metastatic Gastric, Gastroesophageal Junction (GEJ), Esophageal, or Pancreatic Adenocarcinoma. Available at: Accessed May 20255 DLL3-Directed Chimeric Antigen Receptor T-cells in Subjects With Extensive Stage Small Cell Lung Cancer. Available at: Accessed May 20256 American Cancer Society. 'What is Multiple Myeloma?'. Available at: Accessed March 2024.7 American Cancer Society. 'Key Statistics About Multiple Myeloma.' Available at: Accessed March 20248 American Cancer Society. Multiple myeloma: early detection, diagnosis, and staging. Available at: Accessed March 2023.9 Surveillance, Epidemiology, and End Results (SEER) Program. Accessed May 2022.10 Surveillance, Epidemiology, and End Results (SEER) Program. Accessed May 2022.11 American Cancer Society. Accessed May 2022.12 American Cancer Society. May 2022.13 Surveillance, Epidemiology, and End Results (SEER) Program. Accessed May 2022.14 American Cancer Society. 'Key Statistics for Lung Cancer.' Accessed November 2022.15 Byers LA, Rudin CM. Small cell lung cancer: where do we go from here? Cancer. 2015;121(5):664-72.16 Rare Diseases. 'Rare Disease Database.' Accessed November 2022.17 Gong J, Salgia R. Managing patients with relapsed small-cell lung cancer. J Oncol Pract. 2018;14(6): in to access your portfolio
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Metsera Announces Positive Phase 1 Data of First-in-Class Once-Monthly Amylin Candidate MET-233i
Placebo-subtracted mean weight loss up to 8.4% at Day 36 19-day observed half-life supports once-monthly dosing as monotherapy and potential first-in-category monthly GLP-1 + Amylin combination Well-tolerated with no safety signals Company to host conference call and webcast today at 8:00 A.M. ET NEW YORK, June 09, 2025 (GLOBE NEWSWIRE) -- Metsera, Inc. (Nasdaq: MTSR), today announced positive topline data from the Phase 1 clinical trial of MET-233i, an ultra-long acting amylin analog engineered for class-leading durability, potency, and combinability with Metsera's fully-biased monthly GLP-1 receptor agonist candidate, MET-097i. In the study, MET-233i demonstrated up to 8.4% mean placebo-subtracted weight loss at Day 36, a 19-day observed half-life supporting once-monthly dosing, and a favorable tolerability profile with no safety signals. 'We are excited by these impressive results from MET-233i, which demonstrate exceptional efficacy with no safety signals, and enable the potential first monthly multi-NuSH combination,' said Steve Marso, M.D., Chief Medical Officer of Metsera. 'We observed five-week body weight loss comparable to that of leading GLP-1-based medicines, and we identified efficacious starting doses with placebo-like tolerability. These data position MET-233i as a potential best-in-class amylin and support a category-leading profile in combination with MET-097i.' The randomized, placebo-controlled, double-blind Phase 1 trial was designed to evaluate the pharmacokinetics, efficacy, and safety of subcutaneous MET-233i in 80 participants with overweight or obesity without type 2 diabetes. MET-233i was evaluated at single doses from 0.15 mg to 2.4 mg, and multiple doses from 0.15 mg to 1.2 mg given once weekly over five weeks without titration. The trial population was broadly balanced in gender between MET-233i and placebo and had a mean baseline body mass index of approximately 32. Topline results from the Phase 1 trial include: Dose-linear pharmacokinetics with an observed half-life of 19 days from dose to 50% of Cmax. This represents the most durable pharmacokinetic profile of any known amylin analog and supports the potential for once-monthly dosing with simplified titration. MET-233i's exposure profile after multiple doses matched that of MET-097i, supporting combinability as a potential first-in-category once-monthly multi-NuSH combination. These data further substantiate HALO™, Metsera's proprietary, novel peptide stabilization and lipidation platform technology. Body weight loss up to 8.4%. Body weight loss was dose-dependent, ranging up to a placebo-subtracted mean of 8.4% at Day 36 after five weekly doses of 1.2 mg, with individual responses as high as 10.2%. In the single ascending dose (SAD) portion of the trial, substantial weight loss was maintained more than four weeks after dosing, supported by the ultra-long pharmacokinetics observed for MET-233i. Favorable tolerability results. Gastrointestinal adverse events in the multiple ascending dose (MAD) portion of the trial were all mild, dose-dependent, and primarily confined to the first week of dosing, implying rapid onset of tolerance despite a three-fold accumulation of exposure over five weeks. Anticipated starting doses of 0.15 mg and 0.3 mg demonstrated tolerability results comparable to placebo in both the SAD and the MAD portions of the trial. No safety signals. There were no severe or serious adverse events observed in the SAD or MAD portion of the trial to date. 'Amylin agonism has emerged as a central therapeutic mechanism for metabolic diseases, but candidates in development have been limited to weekly dosing,' said Professor Carel le Roux, Director of the Metabolic Medicine Group and Chair in Experimental Pathology at University College Dublin. 'The durability and efficacy of MET-233i in this trial, along with its combinability with Metsera's GLP-1 RA, make it the potential first monthly multi-NuSH combination candidate for patients seeking greater levels of well-tolerated weight loss with a more convenient dosing schedule.'Next StepsBased on these positive topline data, Metsera is rapidly advancing MET-233i as a monotherapy and in combination with MET-097i: An ongoing monotherapy trial evaluates 12 weekly doses of MET-233i with dose titration, followed by an exposure-matched monthly dose at week 13. Topline data from this trial are expected in late 2025. Metsera has extended an ongoing co-administration trial of MET-233i and MET-097i to twelve weeks, with topline data expected by year-end 2025 or early 2026. The Company also expects to report topline clinical data from its ultra-long acting GIP receptor agonist, MET-034i, in combination with MET-097i, in late 2025. We anticipate that MET-034i will be the third peptide engineered with Metsera's HALO™ platform to enter clinical Call and Webcast InformationMetsera will host a conference call and webcast today, June 9, 2025, at 8:00 A.M. Eastern Time to discuss the Phase 1 clinical trial of MET-233i. A live webcast of the call and a replay will be available on the Events page in the Investors & News section of the Metsera website at To access the call by phone, participants should visit this link to receive dial-in details: About MET-233i MET-233i is an ultra-long acting, subcutaneously injectable monthly amylin analog engineered for class-leading durability, potency, and combinability in solution with Metsera's fully-biased, ultra-long acting GLP-1 RA candidate MET-097i, with matched solubility parameters and observed half-lives. MET-233i is being explored in clinical studies as a monotherapy and in combination with MET-097i. Metsera is developing the combination of MET-233i and MET-097i via the FDA biologic pathway with the intent to pursue the combination's regulatory approval in the United States under a Metsera's HALO™ peptide stabilization and lipidation platformHALO™ is Metsera's novel peptide stabilization and lipidation platform technology that enables peptides to bind simultaneously to albumin and to a drug target, designed to facilitate a half-life approaching that of albumin and exceeding that of other NuSH peptides. This ultra-long half-life may enable monthly dosing, improved tolerability, and improved Metsera, is a clinical-stage biopharmaceutical company accelerating the next generation of medicines for obesity and metabolic diseases. Metsera is advancing a broad portfolio of oral and injectable incretin, non-incretin and combination therapies with potential best-in-class profiles to address multiple therapeutic targets and meet the future needs of a rapidly evolving weight loss treatment landscape. Metsera was founded in 2022 and is based in New York City. For more information, please visit us at and follow us on LinkedIn and X. Metsera may use its website as a distribution channel of material information about the Company. Financial and other important information regarding the Company is routinely posted on and accessible through the Investors & News section of its website at In addition, you may sign up to automatically receive email alerts and other information about the Company by using the 'Email Alerts' option on the Investors & Media page and submitting your email address. Forward Looking StatementsThis press release includes 'forward-looking statements' within the meaning of the Private Securities Litigation Reform Act of 1995. The Company intends such forward-looking statements to be covered by the safe harbor provisions for forward-looking statements contained in Section 27A of the Securities Act of 1933, as amended and Section 21E of the Securities Exchange Act of 1934, as amended. All statements contained in this press release other than statements of historical fact should be considered forward-looking statements, including, without limitation, statements related to the timelines, design and results of the Company's clinical trials and data releases; the Company's product candidate pipeline and milestone events; potential benefits of treatment with the Company's product candidates; and anticipated market opportunity and strategy. When used herein, words including 'anticipate,' 'believe,' 'can,' 'continue,' 'could,' 'designed,' 'estimate,' 'expect,' 'forecast,' 'goal,' 'intend,' 'may,' 'might,' 'plan,' 'possible,' 'potential,' 'predict,' 'project,' 'should,' 'target,' 'will,' 'would' and similar expressions are intended to identify forward-looking statements, though not all forward-looking statements use these words or expressions. All forward-looking statements are based upon the Company's current expectations and various assumptions. The Company believes there is a reasonable basis for its expectations and beliefs, but they are inherently uncertain. The Company may not realize its expectations, and its beliefs may not prove correct. Actual results could differ materially from those described or implied by such forward-looking statements as a result of various important factors, including, without limitation, our limited operating history; our ability to generate revenue or become profitable; failure to obtain additional capital when needed on acceptable terms or at all; raising additional capital may cause dilution to our stockholders or require us to relinquish rights to our technologies or product candidates; our dependence on the success of our product candidates; risks associated with preclinical and clinical development; difficulties or delays in the commencement or completion, or the termination or suspension, of clinical trials; our ability to timely enroll patients in our clinical trials; if our current or future product candidates are associated with side effects, adverse events or other properties or safety risks; risks associated with the regulatory approval processes of the FDA and comparable foreign authorities; risks associated with conducting clinical trials and preclinical studies outside of the United States; our reliance on third parties to conduct clinical trials and preclinical studies; our reliance on third parties for the manufacture and shipping of our product candidates; risks associated with our license and collaboration agreements and future strategic alliances; significant competition in our industry; product candidates for which we intend to seek approval as biologic products may face competition sooner than anticipated; our success is dependent on our ability to attract and retain highly qualified management and other clinical and scientific personal; if we or our licensors are unable to obtain, maintain, defend and enforce patent or other intellectual property protection for our current or future product candidates or technology; risks associated with our common stock and the other important factors discussed under the caption 'Risk Factors' in its filings with the Securities and Exchange Commission, including in its Annual Report on Form 10-K for the year ended December 31, 2024 and its Quarterly Report on Form 10-Q for the quarterly period ended March 31, 2025, which are accessible on the SEC's website at and the Investors section of the Company's website at Any such forward-looking statements represent management's estimates as of the date of this press release. While the Company may elect to update such forward-looking statements at some point in the future, except as required by law, it disclaims any obligation to do so, even if subsequent events cause the Company's views to change. These forward-looking statements should not be relied upon as representing the Company's views as of any date subsequent to the date of this press release. Contact:Jono EmmettMetseramedia@
