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Exelixis to Present Positive Preclinical Data Across Its Pipeline Portfolio for Advanced Cancers at AACR 2025

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Exelixis (NASDAQ: EXEL) will present preclinical data for four pipeline molecules at the AACR Annual Meeting 2025 in Chicago. The presentations will showcase both small molecule and biotherapeutic development candidates for advanced solid tumors.

The pipeline includes:

  • XL495: A PKMYT1 inhibitor showing potential anti-tumor activity, currently in phase 1 clinical trials
  • XB371: A tissue factor-targeting antibody-drug conjugate with planned FDA application in 2025
  • XL309: A USP1 inhibitor active in BRCA 1/2 mutations, currently in phase 1 trials
  • XB628: A first-in-class PD-L1 x NKG2A bispecific antibody with FDA-cleared IND application

Exelixis (NASDAQ: EXEL) presenterà dati preclinici per quattro molecole in fase di sviluppo al Congresso Annuale AACR 2025 a Chicago. Le presentazioni metteranno in evidenza sia candidati a piccole molecole che terapie biotherapeutiche per tumori solidi avanzati.

Il pipeline include:

  • XL495: Un inibitore di PKMYT1 che mostra potenziale attività antitumorale, attualmente in fase 1 di sperimentazione clinica
  • XB371: Un coniugato anticorpo-farmaco mirato al fattore tissutale con richiesta FDA pianificata per il 2025
  • XL309: Un inibitore di USP1 attivo nelle mutazioni BRCA 1/2, attualmente in fase 1 di sperimentazione
  • XB628: Un anticorpo bispecifico PD-L1 x NKG2A di prima classe con richiesta IND approvata dalla FDA

Exelixis (NASDAQ: EXEL) presentará datos preclínicos de cuatro moléculas en desarrollo en la Reunión Anual de AACR 2025 en Chicago. Las presentaciones mostrarán tanto candidatos de pequeñas moléculas como terapias bioterapéuticas para tumores sólidos avanzados.

El pipeline incluye:

  • XL495: Un inhibidor de PKMYT1 que muestra actividad antitumoral potencial, actualmente en ensayos clínicos de fase 1
  • XB371: Un conjugado anticuerpo-fármaco dirigido al factor tisular con una solicitud FDA planificada para 2025
  • XL309: Un inhibidor de USP1 activo en mutaciones BRCA 1/2, actualmente en ensayos de fase 1
  • XB628: Un anticuerpo bispecífico PD-L1 x NKG2A de primera clase con solicitud IND aprobada por la FDA

Exelixis (NASDAQ: EXEL)는 시카고에서 열리는 AACR 연례 회의 2025에서 네 가지 파이프라인 분자의 전임상 데이터를 발표할 예정입니다. 발표는 고급 고형 종양을 위한 소분자 및 생물 치료 후보를 모두 선보일 것입니다.

파이프라인에는 다음이 포함됩니다:

  • XL495: 잠재적인 항종양 활성을 보이는 PKMYT1 억제제로 현재 1상 임상 시험 중입니다
  • XB371: 2025년 FDA 신청 계획이 있는 조직 인자 표적 항체-약물 접합체
  • XL309: BRCA 1/2 변이에 활성인 USP1 억제제로 현재 1상 시험 중입니다
  • XB628: FDA 승인 IND 신청이 있는 1세대 PD-L1 x NKG2A 이중 특이성 항체

Exelixis (NASDAQ: EXEL) présentera des données précliniques sur quatre molécules en développement lors de la Réunion Annuelle de l'AACR 2025 à Chicago. Les présentations mettront en avant des candidats à petites molécules ainsi que des thérapies biothérapeutiques pour des tumeurs solides avancées.

Le pipeline comprend:

  • XL495: Un inhibiteur de PKMYT1 montrant une activité antitumorale potentielle, actuellement en essais cliniques de phase 1
  • XB371: Un conjugué anticorps-médicament ciblant le facteur tissulaire avec une demande FDA prévue pour 2025
  • XL309: Un inhibiteur de USP1 actif dans les mutations BRCA 1/2, actuellement en phase 1 d'essai
  • XB628: Un anticorps bispécifique PD-L1 x NKG2A de première classe avec une demande IND approuvée par la FDA

Exelixis (NASDAQ: EXEL) wird auf dem AACR-Jahrestreffen 2025 in Chicago präklinische Daten zu vier Pipeline-Molekülen präsentieren. Die Präsentationen werden sowohl kleine Moleküle als auch biotherapeutische Entwicklungskandidaten für fortgeschrittene solide Tumoren vorstellen.

Die Pipeline umfasst:

  • XL495: Ein PKMYT1-Inhibitor, der potenzielle antitumorale Aktivität zeigt und sich derzeit in klinischen Phase-1-Studien befindet
  • XB371: Ein Antikörper-Wirkstoff-Konjugat, das auf Gewebefaktoren abzielt, mit geplanter FDA-Anwendung im Jahr 2025
  • XL309: Ein USP1-Inhibitor, der bei BRCA 1/2-Mutationen aktiv ist und sich derzeit in Phase-1-Studien befindet
  • XB628: Ein erstklassiger PD-L1 x NKG2A bispezifischer Antikörper mit von der FDA genehmigter IND-Anwendung

Positive
  • Multiple pipeline candidates advancing with potential for best/first-in-class therapies
  • Two compounds (XL495 and XL309) already in phase 1 clinical trials
  • FDA clearance received for XB628's Investigational New Drug application
  • XB371 progressing toward FDA application submission in 2025
Negative
  • All candidates still in early development stages with no proven clinical efficacy
  • Significant R&D investments required for multiple clinical programs

Insights

Exelixis's presentation of preclinical data for four pipeline molecules at AACR 2025 demonstrates meaningful progress in diversifying their oncology portfolio beyond their current commercial products. Two key small molecules employ synthetic lethality - a precision approach that selectively targets cancer cells with specific genetic vulnerabilities while sparing normal tissue:

  • XL495 (PKMYT1 inhibitor) and XL309 (USP1 inhibitor) have both advanced to Phase 1 clinical trials, indicating rapid development progression
  • XB628, a first-in-class bispecific antibody targeting both PD-L1 and NKG2A, recently received FDA clearance for its Investigational New Drug application
  • XB371, an antibody-drug conjugate targeting tissue factor, is progressing toward IND submission in 2025

The expansion into multiple therapeutic modalities (small molecules, antibody-drug conjugates, and bispecific antibodies) represents Exelixis's strategic evolution from a primarily small-molecule company to one with broader technological capabilities. While these programs remain in early development stages and are years from potential commercialization, the FDA clearance for XB628 and advancement of two candidates to clinical trials demonstrate tangible regulatory progress. For investors, this pipeline update confirms Exelixis's continued R&D investment but doesn't substantially alter near-term growth projections.

– Presentations will highlight best- and/or first-in-class potential of four small molecule and biotherapeutic development candidates for investigation in patients with advanced solid tumors –

ALAMEDA, Calif.--(BUSINESS WIRE)-- Exelixis, Inc. (Nasdaq: EXEL) today announced that preclinical data will be presented for four pipeline molecules at the American Association for Cancer Research (AACR) Annual Meeting 2025 taking place April 25-30 in Chicago, IL.

“We are excited to share preclinical data from four of our pipeline molecules that constitute the next phase in our commitment to the discovery and development of innovative cancer treatments,” said Dana T. Aftab, Ph.D., Executive Vice President, Discovery & Translational Research, and Chief Scientific Officer, Exelixis. “The results support the advancement into clinical development of these biotherapeutics and small molecules, as well as their potential to become best- and/or first-in-class therapies with differentiated clinical profiles.”

Exelixis will present preclinical data for XL495 and XL309, small molecules that have demonstrated synthetic lethality in the context of certain genetic anomalies frequently found in some tumors. Preclinical data will also be presented for the PD-L1xNKG2A-targeting bispecific antibody XB628 and the tissue factor-targeting antibody-drug conjugate XB371. Initial details about the poster presentations can be found below. Full data will be presented at the AACR Annual Meeting.

Abstract 1733: XL495 is a potent, selective, and orally bioavailable inhibitor of PKMYT1
Lead Author: Dana Gwinn, Ph.D.
Session Title: Kinase and Phosphatase Inhibitors 1
Monday, April 28, 2:00-5:00 p.m. CT
Preclinical results will be presented for XL495, a novel, potent small molecule inhibitor of PKMYT1. The inhibition of PKMYT1 is synthetically lethal in cells with genetic anomalies that lead to replication stress—a common occurrence in cancer cells but not in normal cells. Data from the analysis show XL495 has demonstrated the potential for anti-tumor activity alone and in combination with DNA-damaging agents. A phase 1 clinical study of XL495 in patients with locally advanced or metastatic solid tumors, both as monotherapy and in combination with select cytotoxic agents in tumor-specific indications, is underway.

Abstract 2936: Preclinical characterization of XB371, a novel anti-tissue factor antibody-drug conjugate
Lead Author: Kathy Gogas, Ph.D.
Session Title: Growth Factor Receptors and Other Surface Antigens as Targets for Therapy 1
Monday, April 28, 2:00-5:00 p.m. CT
This poster presentation will highlight preclinical data for XB371, an antibody-drug conjugate, constructed using Catalent’s SMARTag® site-specific bioconjugation platform, that pairs a tissue factor-targeting antibody with a topoisomerase inhibitor payload using a novel cleavable linker. This design may offer the molecule broad applicability across tumor types and a clinically differentiated potential. Results to be presented support in vitro cell killing activity and in vivo efficacy, supporting the advancement of XB371 into clinical development. Exelixis is planning to submit an investigational new drug application to the U.S. Food and Drug Administration (FDA) for XB371 in 2025.

Abstract 5723: XL309 is a potent, selective, and orally bioavailable USP1 inhibitor active as monotherapy and in combination with PARP inhibitors or irinotecan
Lead Author: Alex Charruyer-Reinwald, Ph.D.
Session Title: PARP Inhibitors
Tuesday, April 29, 2:00-5:00 p.m. CT
Preclinical results will be presented for XL309, a potent and selective small molecule inhibitor of USP1, the inhibition of which is lethal in cells with BRCA 1/2 mutations. The findings demonstrate activity of XL309 alone or in combination with PARP or topoisomerase inhibitors. A phase 1 clinical study of XL309 as a monotherapy or in combination with olaparib in patients with advanced solid tumors is underway.

Abstract 6067: Preclinical evaluation of XB628: A novel PD-L1 x NKG2A bispecific antibody
Lead Author: Bee-Cheng Sim, Ph.D.
Session Title: Antibodies 3: Multi-Target Checkpoint Inhibitors and Immune Activators
Tuesday, April 29, 2:00-5:00 p.m. CT
Preclinical data on XB628, a first-in-class bispecific antibody that simultaneously targets PD-L1 and NKG2A, will be presented. Data from this analysis show that XB628 is efficacious in tumor cell killing in vitro and in vivo, supporting advancement of this molecule into clinical development. Earlier this month, the U.S. FDA cleared Exelixis’ Investigational New Drug application for XB628.

More information about Exelixis’ pipeline is available at Exelixis.com.

About Exelixis
Exelixis is a globally ambitious oncology company innovating next-generation medicines and regimens at the forefront of cancer care. Powered by drug discovery and development excellence, we are rapidly evolving our product portfolio to target an expanding range of tumor types and indications with our clinically differentiated pipeline of small molecules, antibody-drug conjugates and other biotherapeutics. This comprehensive approach harnesses decades of robust investment in our science and partnerships to advance our investigational programs and extend the impact of our flagship commercial product, CABOMETYX® (cabozantinib). Exelixis is driven by a bold scientific pursuit to create transformational treatments that give more patients hope for the future. For information about the company and its mission to help cancer patients recover stronger and live longer, visit www.exelixis.com, follow @ExelixisInc on X (Twitter), like Exelixis, Inc. on Facebook and follow Exelixis on LinkedIn.

Forward-Looking Statements
This press release contains forward-looking statements, including, without limitation, statements related to: the presentation of positive preclinical data for advanced cancers at AACR 2025; the best- and/or first-in-class potential of small molecule and biotherapeutic development candidates for investigation in patients with advanced solid tumors; Exelixis’ belief in the potential of these biotherapeutics and small molecules to become best- and/or first-in-class therapies with differentiated clinical profiles; Exelixis’ plans to submit any investigational new drug applications to the FDA; and Exelixis’ scientific pursuit to create transformational treatments that give more patients hope for the future. Any statements that refer to expectations, projections or other characterizations of future events or circumstances are forward-looking statements and are based upon Exelixis’ current plans, assumptions, beliefs, expectations, estimates and projections. Forward-looking statements involve risks and uncertainties. Actual results and the timing of events could differ materially from those anticipated in the forward-looking statements as a result of these risks and uncertainties, which include, without limitation: the availability of data at the referenced times; complexities and the unpredictability of the regulatory review and approval processes in the U.S. and elsewhere; Exelixis’ continuing compliance with applicable legal and regulatory requirements; unexpected concerns that may arise as a result of the occurrence of adverse safety events or additional data analyses of clinical trials; the costs of conducting clinical trials; Exelixis’ ability to protect their respective intellectual property rights; market competition; changes in economic and business conditions; and other factors affecting Exelixis and its development programs detailed from time to time under the caption “Risk Factors” in Exelixis’ most recent Annual Report on Form 10-K and subsequent Quarterly Reports on Form 10-Q, and in Exelixis’ future filings with the Securities and Exchange Commission. All forward-looking statements in this press release are based on information available to Exelixis as of the date of this press release, and Exelixis undertakes no obligation to update or revise any forward-looking statements contained herein, except as required by law.

Exelixis, the Exelixis logo and CABOMETYX are registered U.S. trademarks of Exelixis.
SMARTag® is a registered trademark of Catalent Pharma Solutions, Inc.

Investors Contact:

Susan Hubbard

EVP, Public Affairs and

Investor Relations


Exelixis, Inc.

650-837-8194

shubbard@exelixis.com

Media Contact:

Stekki Millman

Senior Director, Public Affairs

Exelixis, Inc.

650-837-7187

smillman@exelixis.com

Source: Exelixis, Inc.

FAQ

What are the four pipeline molecules Exelixis (EXEL) is presenting at AACR 2025?

Exelixis is presenting XL495 (PKMYT1 inhibitor), XB371 (antibody-drug conjugate), XL309 (USP1 inhibitor), and XB628 (PD-L1xNKG2A bispecific antibody).

When will Exelixis (EXEL) submit the FDA application for XB371?

Exelixis plans to submit an investigational new drug application to the FDA for XB371 in 2025.

Which Exelixis (EXEL) pipeline candidates are currently in phase 1 clinical trials?

Both XL495 and XL309 are currently in phase 1 clinical trials for patients with advanced solid tumors.

What is the mechanism of action for Exelixis's (EXEL) XB628?

XB628 is a first-in-class bispecific antibody that simultaneously targets PD-L1 and NKG2A for tumor cell killing.
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