Leap Therapeutics Presents Final Data from DeFianCe Study at ESMO 2025

On October 20, 2025 Leap Therapeutics, Inc. (Nasdaq:LPTX), a biotechnology company focused on developing targeted and immuno-oncology therapeutics, reported final results from Part B of the DeFianCe study (NCT05480306), a Phase 2 study of sirexatamab (DKN-01), an anti-DKK1 monoclonal antibody, in combination with bevacizumab and chemotherapy (Sirexatamab Arm) compared to bevacizumab and chemotherapy (Control Arm) in patients with microsatellite stable (MSS) colorectal cancer (CRC) who have received one prior systemic therapy for advanced disease. The final clinical results were presented on behalf of the DeFianCe study investigators by Zev Wainberg, MD, Professor of Medicine and Co-Director of the GI Oncology Program at UCLA in a Mini Oral session at the European Society for Medical Oncology (ESMO) (Free ESMO Whitepaper) Congress 2025 in Berlin, Germany.

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"Circulating DKK1 is a negative prognostic factor and elevated in patients with advanced, metastatic CRC. The data presented at ESMO (Free ESMO Whitepaper) demonstrate that sirexatamab, which binds to and removes free DKK1, has significant potential to provide a survival benefit for CRC patients who have high DKK1 levels and who are likely to have poor outcomes receiving the current standard of care alone," said Dr. Wainberg. "Sirexatamab has the potential to be a valuable addition to the CRC treatment paradigm as a targeted therapeutic for patients with high DKK1 and should move forward to be evaluated in a biomarker-focused registrational trial."

The DeFianCe study was a two part, open-label, multi-country study. Part A of the DeFianCe study enrolled 33 patients, including a significant number of patients who had early progression on first-line therapy, previous exposure to bevacizumab, tumors with RAS mutations, or liver and lung metastases. The study expanded into a 188 patient Part B randomized controlled trial. The primary objective of the study was progression-free survival PFS. Secondary objectives included objective response rate (ORR), duration of response, and overall survival (OS). A key pre-defined exploratory population was those patients who had high levels of circulating DKK1, as measured by a biomarker assay.

Key Part B DeFianCe Study Findings:

· Across the DKK1-high (upper median) patients (n=88):
o ORR was 38.0% in the Sirexatamab Arm compared to 23.7% ORR in the Control Arm.
o mPFS was 9.03 months in the Sirexatamab Arm compared to 7.06 months in the Control Arm, Hazard Ratio (HR) 0.61, p-value = 0.0255.
o mOS was not reached in the Sirexatamab Arm compared to 14.39 months in the Control Arm, HR 0.42, p-value = 0.0118.

· Across the DKK1-high (upper quartile) patients (n=44):
o ORR was 44.0% in the Sirexatamab Arm compared to 15.8% ORR in the Control Arm.
o mPFS was 9.36 months in the Sirexatamab Arm compared to 5.88 months in the Control Arm, HR 0.46, p-value = 0.0168.
o mOS was not reached in the Sirexatamab Arm compared to 9.66 months in the Control Arm, HR 0.17, p-value < 0.001.

· In the full intent-to-treat population (n=188):
o ORR was 35.1% in the Sirexatamab Arm compared to 26.6% ORR in the Control Arm.
o mPFS was 9.2 months in the Sirexatamab Arm compared to 8.3 months in the Control Arm, HR 0.84, p-value = 0.1712.
o Event-free rate favors Sirexatamab Arm beginning at month 9 (53 vs 47%) with further separation at month 12 (34 vs 23%).

· Sirexatamab, in combination with chemotherapy and bevacizumab, was safe and well tolerated
o Overall treatment-emergent adverse effects (TEAE) profile was similar between the Sirextamab and Control Arms, suggesting sirexatamab did not impact the safety profile when combined with the standard of care.

"The DeFianCe study results demonstrate the significant potential of sirexatamab in patients with advanced CRC. Patients with this aggressive cancer, particularly those with high DKK1 levels, have poor overall survival outcomes and few promising second-line or later options," said Douglas E. Onsi, President and Chief Executive Officer of Leap. "Sirexatamab has repeatedly demonstrated its potential as a novel, first-in-class antibody targeting DKK1 that provides deep and durable benefit for patients in desperate need of new therapies. With support from a recently completed financing, Leap plans to engage with regulatory authorities over the registrational path for sirexatamab in CRC and to optimize the DKK1 biomarker diagnostic test that could be used to identify these CRC patients with poor prognosis."

(Press release, Leap Therapeutics, OCT 20, 2025, View Source [SID1234656817])

IMUNON Hosts R&D Day Highlighting Progress on OVATION 3 Study in Pursuit of First Frontline Immunotherapy for Advanced Ovarian Cancer

On October 20, 2025 IMUNON, Inc. (Nasdaq: IMNN), a clinical-stage company in Phase 3 development with its DNA-mediated immunotherapy, reported that it will host an R&D Day for investors at the Harvard Club (35 West 44th Street) in New York City on November 10, 2025, beginning at 8:00 a.m. ET.

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The investor event will feature ovarian cancer thought leaders, principal investigators from the Company’s Phase 3 OVATION 3 Study and Phase 2 minimal residual disease (MRD) clinical trial, conducted in partnership with Break Through Cancer Foundation, statistical experts and members of IMUNON’s management team, delivering updates on new IMNN-001 data and discussing progress with the OVATION 3 Study and IMNN-001’s potential role in transforming the treatment landscape for women with advanced ovarian cancer. There will be a live Q&A session and networking opportunities with the speakers and IMUNON management team following the formal presentations.

Featured Presentations and Speakers:

Title: Advancing Ovarian Cancer Care: IMNN-001’s Potential to Transform the Microtumor Environment from Cold to Hot in Phase 3
Presenter: Premal H. Thaker, M.D., David & Lynn Mutch Distinguished Professor of Obstetrics & Gynecology, Chief of Gynecologic Oncology, Director of Gynecologic Oncology Clinical Research, Professor in Gynecologic Oncology, Washington University School of Medicine

Title: Unveiling Progress: Safety, Tolerability, and Translational Insights for IMNN-001
Presenter: Amir Jazaeri, M.D., Vice Chair for Clinical Research, Director, Gynecologic Cancer Immunotherapy Program, Department of Gynecologic Oncology and Reproductive Medicine, University of Texas MD Anderson Cancer Center
Title: OVATION 3 Probability of Success & the Statistical Properties of Phase 3 Trial Design
Presenter: Giorgio Paulon, Ph.D., Director & Senior Statistical Scientist, Berry Consultants, LLC
Title: Phase 3 OVATION 3 Trial Update
Presenter: Douglas V. Faller, M.D., Ph.D., Chief Medical Officer, IMUNON

(Press release, IMUNON, OCT 20, 2025, View Source [SID1234656816])

Immatics Highlights Compelling Anti-Tumor Activity of Anzu-cel PRAME Cell Therapy in Metastatic Uveal Melanoma at the ESMO 2025 Presidential Symposium

On October 20, 2025 Immatics N.V. (NASDAQ: IMTX, "Immatics" or the "Company"), a clinical-stage biopharmaceutical company and the global leader in precision targeting of PRAME, reported the presentation of updated data from 16 patients with metastatic uveal melanoma treated with anzu-cel PRAME cell therapy.

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The uveal melanoma data from the ongoing Phase 1b trial will be presented today at the European Society for Medical Oncology (ESMO) (Free ESMO Whitepaper) Congress 2025 during the Presidential Symposium III by Sapna Patel, M.D., Professor of Medicine, University of Colorado Cancer Center. The slides are accessible in the ‘Events & Presentations’ section of the Investors & Media section of the Company’s website.

"Patients with metastatic uveal melanoma face a poor prognosis and represent a population in need of better outcomes, given the limited options currently available," said Sapna Patel, M.D. "I believe the results with anzu-cel presented today signal a much-needed breakthrough for patients with metastatic uveal melanoma. These findings highlight the potential of anzu-cel to redefine the treatment paradigm for uveal melanoma and bring new hope to patients who urgently need more effective options."

"Our goal is to leverage every opportunity to bring innovative PRAME therapies to patients with limited treatment options," said Cedrik Britten, M.D., Chief Medical Officer at Immatics. "The continued strong clinical data presented today reinforce our conviction in maximizing the potential of our PRAME cell therapy, anzu-cel, and expanding its development into metastatic uveal melanoma, a rare cancer with very high unmet medical need. We are excited to further execute on our PRAME franchise and bring meaningful progress to patients in need."

Presidential Symposium III Presentation Summary – Anzu-cel Phase 1b Trial

Patient Population: Difficult-to-treat patient population with metastatic uveal melanoma

As of September 24, 2025, 16 patients with metastatic uveal melanoma were administered a one-time infusion of anzu-cel at the recommended Phase 2 dose (RP2D, 1 to 10 billion total TCR T cells) as part of the anzu-cel Phase 1b dose expansion. Patients received a median infused TCR T-cell dose of ~4 billion (range 1.62 – 8.43 billion TCR T cells) and had a median of 2 lines of prior systemic treatments. Patients had a median target lesion sum of a diameter of 103 mm (ranging from 31 to 210 mm), and 81% of patients had liver and extrahepatic metastasis.

Anti-tumor Activity and Durability: Continued strong anti-tumor activity and durability of anzu-cel PRAME cell therapy

Updated data of a one-time infusion of anzu-cel PRAME cell therapy demonstrated promising benefit in a difficult-to-treat population with limited effective treatment options:

Confirmed objective response rate (cORR) of 67% (10/151)
Disease control rate (DCR) of 88% (14/16)
Median duration of response (mDOR) of 11 months (min 4.4, max 31.6 months)
Median progression-free survival (mPFS) of 8.5 months (min 1.4, max 32.9) at a mFU of 10.4 months. The PFS rate was 69% at six months and 39% at 12 months
Median overall survival (mOS) not reached (min 4.3+, max 34.2+ months) at a mFU of 14.3 months. The OS rate was 71% at 12 months

Anti-tumor activity was observed in liver and extrahepatic metastases, including lung, lymph node, abdomen/peritoneum and others. 14/16 patients had target lesions in the liver and treatment with anzu-cel led to a median shrinkage in liver target lesion size of 49.6%.

Notably, 11 out of the 16 patients received a TCR bispecific (ten gp-100-targeting, one PRAME-targeting) as prior systemic treatment line, and thereof, six achieved a confirmed partial response, one a partial response and three stable disease. These results demonstrate anti-tumor activity of anzu-cel in patients who received prior TCR-based therapies.

Safety: Favorable tolerability in uveal melanoma, generally consistent with full anzu-cel tolerability profile

The most frequent treatment-emergent adverse events (TEAs) were anticipated cytopenias associated with lymphodepletion. Expected and manageable cytokine release syndrome (CRS) was mostly Grade 1 or 2, which is consistent with the mechanism of action (Grade 1: 37.5%, Grade 2: 43.8%, Grade 3: 18.8%, Grade 4: 0%). No patients experienced long-term CRS, and most CRS was resolved by day 14. No anzu-cel-related Grade 5 events were observed.

Tolerability in the uveal melanoma subset was generally consistent with the full anzu-cel tolerability profile in the Phase 1b.

Development Path for Anzu-cel in Metastatic Uveal Melanoma

Based on the promising clinical data in patients with metastatic uveal melanoma, Immatics has initiated a Phase 2 cohort with approximately 30 uveal melanoma patients planned. The cohort is being conducted at select centers in the U.S. and Germany with deep expertise in uveal melanoma. Given the high prevalence of PRAME expression in uveal melanoma, prospective PRAME testing is no longer required for inclusion in the clinical trial.

The consistent tolerability, anti-tumor activity and pharmacokinetic profile of anzu-cel across both uveal and cutaneous melanoma provide a strong rationale for pursuing a parallel late-stage development strategy to serve both patient populations.

About PRAME
PRAME is a target expressed in more than 50 cancers. Immatics is the global leader in precision targeting of PRAME and has the broadest PRAME franchise with the most PRAME indications and modalities. The Immatics PRAME franchise currently includes three product candidates, two therapeutic modalities and a combination therapy that target PRAME: anzu-cel (IMA203) PRAME cell therapy, IMA203CD8 PRAME cell therapy (GEN2), IMA402 PRAME bispecific, anzu-cel in combination with Moderna’s PRAME cell therapy enhancer.

About Anzu-cel (IMA203) PRAME Cell Therapy
Anzu-cel (anzutresgene autoleucel; IMA203) is a PRAME-directed TCR T-cell therapy engineered to recognize an intracellular PRAME-derived peptide presented by HLA-A*02:01 on the cell surface and initiate a potent and specific anti-tumor response. Anzu-cel PRAME cell therapy is currently being evaluated in a registration-enabling randomized controlled Phase 3 trial, "SUPRAME," in patients with unresectable or metastatic cutaneous melanoma who have disease progression on or after treatment with at least one checkpoint inhibitor. In parallel, the Phase 1b clinical trial in patients with PRAME cancers is ongoing with a focus on uveal melanoma.

(Press release, Immatics, OCT 20, 2025, View Source [SID1234656815])

Exelixis Announces Detailed Results from Phase 3 STELLAR-303 Pivotal Trial Evaluating Zanzalintinib in Combination with an Immune Checkpoint Inhibitor in Metastatic Colorectal Cancer Presented at ESMO 2025 and Published in The Lancet

On October 20, 2025 Exelixis, Inc. (Nasdaq: EXEL) reported detailed results from STELLAR-303, a global phase 3 pivotal trial evaluating zanzalintinib in combination with atezolizumab (Tecentriq) versus regorafenib in patients with previously treated non-microsatellite instability (MSI)-high metastatic colorectal cancer (CRC). As previously announced, the study met one of its dual primary endpoints, demonstrating a 20% reduction in the risk of death with the combination in the intention-to-treat (ITT) population at the final analysis (stratified hazard ratio [HR]: 0.80; 95% confidence interval [CI]: 0.69-0.93; P=0.0045). At a median follow-up of 18.0 months, median overall survival (OS) in the ITT population was 10.9 months with zanzalintinib in combination with atezolizumab versus 9.4 months with regorafenib. Detailed findings from the study, including OS and progression-free survival (PFS) in the ITT population and in the subset of patients without liver metastases, are being presented today at the 2025 European Society for Medical Oncology (ESMO) (Free ESMO Whitepaper) Congress during the Proffered Paper Session 2: GI Tumours, Lower Digestive at 9:25 a.m. CEST and simultaneously published in The Lancet.

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"While treating non-MSI-high metastatic colorectal cancer remains a challenge, the combination of zanzalintinib and atezolizumab has shown consistent benefits across key subgroups of patients," said Anwaar Saeed, M.D., Section Chief of Gastrointestinal Oncology at the University of Pittsburgh, Director of the Gastrointestinal Disease Center at UPMC Hillman Cancer Center and a lead investigator of the trial. "STELLAR-303 is the first immunotherapy-based phase 3 trial that demonstrated improved overall survival with a differentiated kinase inhibitor compared to a standard of care in this patient population. The survival benefit was demonstrated early and was consistent throughout the trial, underscoring the combination’s potential for patients in need of a new and effective treatment option after disease progression."

An OS benefit with the combination was consistently observed across pre-specified subgroups, including geographic region, RAS status, liver involvement and prior anti-VEGF therapy, as presented in Table 1 below. The 12- and 24-month landmark OS estimates were 46% (95% CI: 41-51) and 20% (95% CI: 15-26), respectively, for the combination of zanzalintinib and atezolizumab, and 38% (95% CI: 34-43) and 10% (95% CI: 6-16), respectively, for regorafenib.

TABLE 1

Median OS, months (95% CI)

HR (95% CI)

Zanzalintinib + Atezolizumab

Regorafenib

Geographic region

Asia

11.5 (9.2-13.7)

8.8 (7.8-10.4)

0.77 (0.59-1.00)

Rest of the world

10.9 (9.3-12.3)

9.8 (8.3-10.9)

0.82 (0.68-0.99)

RAS status

Wild type

12.0 (10.1-14.6)

10.4 (8.7-12.3)

0.79 (0.61-1.01)

Mutant

10.3 (9.0-11.9)

8.7 (8.1-9.8)

0.80 (0.66-0.98)

Active liver metastases

Presence

8.9 (8.0-9.9)

7.7 (6.5-8.5)

0.78 (0.65-0.94)

Absence

15.9 (13.5-17.6)

12.8 (10.9-15.5)

0.77 (0.59-1.01)

Prior anti-VEGF antibody treatment

Yes

10.6 (9.3-12.5)

8.8 (8.3-9.9)

0.80 (0.68-0.95)

No

11.5 (8.7-13.5)

11.1 (9.5-12.6)

0.80 (0.56-1.15)

OS = overall survival; CI = confidence interval; HR = hazard ratio; VEGF = vascular endothelial growth factor

Data pertaining to the other dual primary endpoint, OS in patients without liver metastases (non-liver metastases, NLM), were immature at the data cutoff. A prespecified interim analysis showed a trend in OS favoring the combination (15.9 months versus 12.8 months; stratified HR: 0.79; 95% CI: 0.61-1.03; P=0.0875) at a median follow-up of 16.8 months. The trial will proceed to the planned final analysis for this endpoint.

"These detailed results from STELLAR-303 provide further insight into the combination of zanzalintinib and atezolizumab as a potential new option to extend survival in patients with previously treated metastatic colorectal cancer," said Dana T. Aftab, Ph.D., Executive Vice President, Research and Development, Exelixis. "Before the end of this year, we intend to complete the submission of our first new drug application for zanzalintinib as we work toward bringing this combination regimen to a patient community seeking a new and chemotherapy-free option. These data, along with our robust clinical trial program, underscore the progress we are making toward our goal of increasing the scope and scale of the solid tumor types zanzalintinib may help address."

A trend for improvement in PFS with the combination was also observed in the ITT population (stratified HR: 0.68 [95% CI: 0.59–0.79]; median, 3.7 [95% CI: 3.5–3.8] months versus 2.0 [95% CI: 1.9–2.6] months), though statistical superiority cannot be claimed at this time due to the prespecified hierarchical testing strategy. The trend for PFS improvement with zanzalintinib in combination with atezolizumab versus regorafenib was consistent across subgroups.

The safety profiles of zanzalintinib in combination with atezolizumab and of regorafenib were generally consistent with what has been previously observed, and no new safety signals were identified. Grade 3/4 treatment-related adverse events (AEs) occurred in 59% of patients receiving zanzalintinib in combination with atezolizumab and 37% of patients receiving regorafenib. AEs leading to discontinuation of all study treatment occurred in 18% versus 15% of patients, respectively. The most common grade 3/4 treatment-related AEs were hypertension (15% versus 9%, respectively), fatigue (6% versus 2%), diarrhea (6% versus 2%) and proteinuria (6% versus 2%). Deaths considered related to treatment by investigators were two for zanzalintinib, two for atezolizumab, one for the combination and one for regorafenib.

About STELLAR-303
STELLAR-303 (NCT05425940) is a global, multicenter, randomized, phase 3, open-label study that randomized patients 1:1 to either zanzalintinib in combination with atezolizumab (n=451) or regorafenib (n=450). The study includes patients with previously treated non-MSI-high metastatic CRC. The dual primary endpoints of the study are OS in the ITT population and in the NLM subgroup of patients. The ITT population consisted of all randomized patients, regardless of the presence of liver metastases. The NLM subgroup consisted of patients who did not have active liver metastases at baseline as determined by investigator assessment. Secondary endpoints include PFS, objective response rate and duration of response in the ITT population and in the NLM subgroup of patients. More information about the trial is available at ClinicalTrials.gov.

About Zanzalintinib
Zanzalintinib is a novel oral kinase inhibitor that inhibits the activity of the TAM kinases (TYRO3, AXL, MER), MET and VEGF receptors. These kinases play important roles in oncogenic processes including tumor cell proliferation, metastasis, angiogenesis, drug resistance and evasion of antitumor immunity. With zanzalintinib, Exelixis sought to build upon its extensive experience with the target profile of cabozantinib, the company’s flagship medicine, while improving key characteristics, including pharmacokinetic half-life. Zanzalintinib is currently being developed for the treatment of advanced solid tumors, including colorectal cancer, kidney cancer and neuroendocrine tumors.

Zanzalintinib is an investigational agent that is not approved for any use and is the subject of ongoing clinical trials.

About CRC
CRC is the third most common cancer and the second leading cause of cancer-related deaths in the U.S.1 Approximately 154,000 new cases will be diagnosed in the U.S. with around 53,000 expected deaths from the disease in 2025.1 CRC is most frequently diagnosed among people aged 65-74 and is more common in men and in people of non-Hispanic American Indian/Alaska Native descent.2 Nearly a quarter of CRC cases are diagnosed at the metastatic stage, at which point the five-year survival rate is just 16.2%.2 The liver is the most common site for CRC metastasis. Liver metastases significantly impact survival, with a median five-year survival rate of less than 14% when treated with palliative chemotherapy.

(Press release, Exelixis, OCT 20, 2025, View Source [SID1234656814])

Disc Medicine Announces Proposed Public Offering of Common Stock and Pre-Funded Warrants

On October 20, 2025 Disc Medicine, Inc. (NASDAQ: IRON) (Disc), a clinical-stage biopharmaceutical company focused on the discovery, development, and commercialization of novel treatments for patients suffering from serious hematologic diseases, reported the commencement of an underwritten offering of $220.0 million of shares of its common stock and, in lieu of common stock to certain investors that so choose, pre-funded warrants to purchase shares of its common stock, of which $200.0 million of shares are to be offered by Disc and $20.0 million of shares are to be offered by AI DMI LLC (the Selling Stockholder). In addition, the Selling Stockholder intends to grant the underwriters a 30-day option to purchase up to an additional $33.0 million of shares at the public offering price, less underwriting discounts and commissions. The proposed offering is subject to market and other conditions, and there can be no assurance as to whether or when the offering may be completed, or as to the actual size or terms of the offering.

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Disc intends to use the net proceeds from the proposed offering to support the potential commercialization of bitopertin for erythropoietic protoporphyria (EPP) and X-linked protoporphyria (XLP), to fund research and clinical development of its current or additional product candidates, and for working capital and other general corporate purposes. Disc will not receive any proceeds from the sale of shares to be offered by the Selling Stockholder.

Jefferies, Leerink Partners, Morgan Stanley and Cantor are acting as joint book-running managers for the proposed offering.

The proposed offering is being made pursuant to an automatic shelf registration statement on Form S-3 (No. 333-281359) that was previously filed with the Securities and Exchange Commission (SEC) on August 8, 2024 and a resale registration statement on Form S-3 (No. 333-269270) that was previously filed with the SEC on January 18, 2023. This proposed offering is being made only by means of a prospectus supplement and accompanying prospectuses that form a part of the registration statements. A preliminary prospectus supplement and accompanying prospectuses related to the proposed offering will be filed with the SEC and will be available on the SEC’s website at www.sec.gov. Copies of the preliminary prospectus supplement and the accompanying prospectuses relating to this proposed offering may also be obtained, when available, by contacting: Jefferies LLC, Attention: Equity Syndicate Prospectus Department, 520 Madison Avenue, 2nd Floor, New York, NY 10022, by telephone at (877) 821-7388, or by email at [email protected]; Leerink Partners LLC, Attention: Syndicate Department, 53 State Street, 40th Floor, Boston, MA 02109, (800) 808-7525 ext. 6105 or by email at [email protected]; Morgan Stanley & Co. LLC, Attention: Prospectus Department, 180 Varick Street, 2nd Floor, New York, New York 10014; or Cantor Fitzgerald & Co., Attention: Capital Markets, 110 East 59th Street, 6th Floor, New York, New York, 10022, or by email at [email protected].

This press release does not constitute an offer to sell or a solicitation of an offer to buy these securities, nor shall there be any sale of these securities in any state or jurisdiction in which such offer, solicitation or sale would be unlawful prior to registration or qualification under the securities laws of that state or jurisdiction.

(Press release, Disc Medicine, OCT 20, 2025, View Source [SID1234656813])