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YB-800 ADCs Reach Important Milestone: Proof of Concept in Preclinical in Vitro and in Vivo Tests

On April 18, 2025 Ymmunobio AG (YB), a Swiss-based global biotech company dedicated to the development of new cancer therapeutics, reported that its two-antibody drug conjugate (ADC) assets, YB-800ADC1 and YB-800ADC2, have completed the preclinical proof of concept studies (Press release, Ymmunobio, APR 18, 2025, View Source [SID1234651987]). Both in vivo and in vitro studies have reached this important milestone by demonstrating the anti-tumor efficacy of both ADCs.

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The ADCs are derived from YB’s lead antibody YB-800 which targets a novel and first in class tumor marker. They utilize established payloads and a third-generation linker, demonstrating a tumor growth inhibition of 90%.

"These excellent results allow YB to move forward swiftly to prepare for the pivotal toxicology studies. This is a major step towards the clinical development of our ADCs in solid tumors and demonstrates the potential for YB’s ADCs to address unmet needs for cancer patients expressing the new novel tumor marker. In addition, the proof-of-concept data support the preclinical development of the two YB-800 based radiopharmaceuticals developed in collaboration with the Paul Scherer Institute," said Peter Schiemann, CEO.

SparX to Present Phase 1 Clinical Updates of SPX-303, a Dual Checkpoint Bispecific Antibody, at Two Events During AACR 2025

On April 18, 2025 SparX Biopharmaceutical Corp. reported that it will present clinical updates on its lead asset, SPX-303, a first-in-class anti-LILRB2/PD-L1 bispecific antibody, during the Trial-in-Progress poster session at the 2025 American Association for Cancer Research (AACR) (Free AACR Whitepaper) Annual Meeting on April 28, from 2:00 PM to 5:00 PM (Press release, Sparx Therapeutics, APR 18, 2025, View Source [SID1234651986]). The presentation marks the one-year anniversary of the first patient dosing of this novel bispecific antibody in its ongoing Phase 1 clinical trial.

A more comprehensive overview of SPX-303’s dual mechanism, which targets both myeloid and T-cell immune checkpoints, will be featured at a Satellite Symposium themed "Harnessing Super Immunotherapy and ADCs to Redefine the Standard of Care." Co-hosted by the University of Illinois at Chicago Cancer Center and Yao Yuan—Academy for Pharma Innovation, the symposium will convene expert clinicians, academic investigators, and industry leaders to discuss how next-generation immuno-oncology, known as "Super IO," can be synergized with antibody-drug conjugates (ADCs). This innovative approach combines the tumor-targeting precision of ADCs with the immune-activating power of checkpoint inhibitors, aiming to deliver deeper and more durable anti-tumor responses.

SPX-303, a first-in-class bispecific antibody targeting LILRB2 and PD-L1, is currently enrolling patients with resistant or refractory solid tumors at a dose level of 20 mg/kg. "This innovative program represents a significant advancement in macrophage checkpoint blockade and T cell co-engagement strategies," said Dr. Gui-Dong Zhu, CEO of SparX. "It holds promise as a potential next-generation immuno-oncology therapy—or ‘Super IO’ booster—for patients with limited treatment options."

The SPX-303 poster will be presented at Poster #CT116-11 in the Phase I Clinical Trials in Progress session at McCormick Place, Chicago, on April 28, from 2:00 to 5:00 PM. The Satellite Symposium will be held at the Trump International Hotel & Tower Chicago (401 N Wabash Ave, Chicago, IL 60611). SparX welcomes attendees to visit its exhibition booth during the symposium and strongly encourages early registration via the [registration portal] to secure a seat.

About SPX-303

SPX-303 is a first-in-its-class bispecific antibody therapy designed to simultaneously inhibit LILRB2 and PD-L1, two critical immune checkpoint proteins often hijacked by cancer cells. The program represents a novel immunotherapy approach aimed at activating both myeloid and lymphoid immune responses.

MOMA Therapeutics to Present Multiple Posters at the American Association for Cancer Research Annual Meeting 2025

On April 17, 2025 MOMA Therapeutics, a clinical-stage biopharmaceutical company discovering and developing a new generation of precision therapeutics, reported three poster presentations at the 2025 American Association for Cancer Research (AACR) (Free AACR Whitepaper) Annual Meeting, being held April 25 – 30, 2025 in Chicago, IL (Press release, MOMA Therapeutics, APR 17, 2025, View Source [SID1234651984]).

AACR poster presentation details are below:

MOMA-313 is a potent and selective inhibitor of the Polθ DNA helicase domain for the treatment of HR-deficient tumors
Session Title: PO.ET09.05 – Novel Antitumor Agents 1
Location: Section 22
Abstract Number: 1749
Date/Time: April 28, 2025, 9:00 a.m. – 12:00 p.m. CT
Presenting Author: Jordan Krall, Ph.D.

TA repeat expansion outperforms MSI-H status as a predictor of sensitivity to the novel WRN inhibitor MOMA-341
Session Title: PO.ET06.07 – DNA Damage Response and Modulation of DNA Repair 2
Location: Section 15
Abstract Number: 4205
Date/Time: April 29, 2025, 9:00 a.m. – 12:00 p.m. CT
Presenting Author: Allison Drew

Orally Administered MOMA-313 as Monotherapy or Combination Therapy in Participants with Advanced or Metastatic Solid Homologous Recombination (HR)-Deficient Tumors: Phase 1 Study Design
Session Title: CTP01.02 – Phase I Clinical Trials in Progress 2
Location: Section 50
Abstract Number: CT192
Date/Time: April 29, 2025, 9:00 a.m. – 12:00 p.m. CT
Presenting Author: Amita Patnaik, M.D.

Abstracts are currently available on the AACR (Free AACR Whitepaper) website. The posters can be accessed through the "News & Publications" tab on the MOMA Therapeutics website at the time of each presentation’s starting session.

Agilent Receives European IVDR Certification for Companion Diagnostic Assay in Gastric or Gastroesophageal Junction (GEJ) Adenocarcinoma

On April 17, 2025 Agilent Technologies Inc. (NYSE: A) reported its PD-L1 IHC 22C3 pharmDx (Code SK006) assay reported to have received European IVDR certification for the use as a Companion Diagnostic (CDx) to aid in the identification of gastric or gastroesophageal Junction (GEJ) adenocarcinoma patients who may be eligible for treatment with KEYTRUDA (pembrolizumab) (Press release, Agilent, APR 17, 2025, View Source [SID1234651983]). PD-L1 IHC 22C3 pharmDx (Code SK006) is approved for exclusive use with the Agilent Autostainer Link 48 advanced staining solution. KEYTRUDA is an anti-PD-1 therapy developed by Merck (known as MSD outside the United States and Canada).

In addition to gastric or GEJ adenocarcinoma, PD-L1 IHC 22C3 pharmDx is IVDR certified as an aid in identifying non-small cell lung cancer (NSCLC), urothelial carcinoma, esophageal cancer, head and neck squamous cell carcinoma (HNSCC), triple-negative breast cancer (TNBC), and cervical cancer patients for treatment with KEYTRUDA. Consequently, PD-L1 IHC 22C3 pharmDx is labeled for seven cancer indications and is the only IVDR-certified CDx to identify gastric and GEJ adenocarcinoma patients for treatment with KEYTRUDA.

"Immunotherapies, such as KEYTRUDA, are critical for cancer patients," said Nina Green, vice president and general manager of the Clinical Diagnostics Division at Agilent. "With the current European indication expansion of PD-L1 IHC 22C3 pharmDx into gastric or GEJ adenocarcinoma, pathology laboratories can now support an even broader patient population in determining their eligibility for relevant treatment options."

Gastric cancer is a leading cause of cancer-related mortality worldwide. In Europe, gastric adenocarcinoma, typically diagnosed at an advanced stage, has a 5-year survival rate of 26%.2 In 2022, more than 130,000 Europeans were diagnosed with gastric cancer.3

In Europe, KEYTRUDA, in combination with trastuzumab, fluoropyrimidine, and platinum-containing chemotherapy, is indicated for the first-line treatment of patients with locally advanced unresectable or metastatic HER2-positive gastric or GEJ adenocarcinoma whose tumors express PD-L1 (CPS ≥ 1). Furthermore, KEYTRUDA, in combination with fluoropyrimidine and platinum-containing chemotherapy, is indicated for the first-line treatment of patients with locally advanced unresectable or metastatic HER2-negative gastric or GEJ adenocarcinoma whose tumors express PD-L1 (CPS ≥1).4

PD-L1 IHC 22C3 pharmDx was developed by Agilent in partnership with Merck (known as MSD outside the United States and Canada) as a companion diagnostic for KEYTRUDA.

KEYTRUDA is a registered trademark of Merck Sharp & Dohme LLC, a subsidiary of Merck & Co., Inc., Rahway, NJ, USA.

Kairos Pharma Ltd. Announces Department of Defense Grant to Support Its Study of Lead Compound ENV105 to Prevent Drug Resistance in Lung Cancer

On April 17, 2025 Kairos Pharma, Ltd. (NYSE American: KAPA) a clinical stage company involved in treating EGFR-driven lung cancer patients with ENV105 in combination with osimertinib after they fail to respond to single-agent osimertinib in a Phase 1 trial, reported that based on recent breakthroughs in understanding non-small cell lung cancer mechanism of resistance to first line osimertinib treatment, the U.S. Department of Defense ("DoD") is providing $876,000 to advance a strategy to identify patients that are starting to develop resistance at an early stage (Press release, Kairos Pharma, APR 17, 2025, View Source [SID1234651982]). The grant was awarded to identify biomarkers for the Company’s clinical study to address the major challenge in achieving a lasting cure for lung cancer patients. The grant was awarded to Cedars-Sinai Medical Center to support research in Dr. Neil Bhowmick’s laboratory to identify biomarkers of patients with non-small cell carcinoma who have developed resistance to Osimertinib. This will provide a means to identify those patients who will benefit from ENV105.

Kairos Pharma CEO John Yu, M.D., stated, "Peer-reviewed support like this DoD grant is a testament to the sound scientific basis for our current Phase 1 trial in lung cancer patients receiving ENV105. It is particularly gratifying in the current environment, in which these grants are harder to achieve, underscoring the potential for ENV105 to help ensure effective therapy in this lung cancer form common to non-smokers. Grants like this enable us to progress with our trials while minimizing expense and managing our cash burn."

The DoD grant is designed to contribute to a strategy to limit resistance to osimertinib at its most early stages, by identifying patients that would be best helped by ENV105 treatment. In the near term, the Company expects that the funded study may lead to more effective monitoring and early detection of resistance development, allowing for more timely interventions to improve overall survival and quality of life for patients.