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Shattuck Labs Provides Company Update and Announces SL-325, a First-In-Class Death Receptor 3 (DR3) Antagonist Targeting the TL1A/DR3 Signaling Pathway

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Shattuck Labs (Nasdaq: STTK) announced a strategic pipeline prioritization, discontinuing its SL-172154 clinical program due to modest improvements in overall survival for TP53 mutant AML and HR-MDS patients. The company will focus on SL-325, a first-in-class DR3 antagonist antibody for inflammatory bowel disease (IBD), with an IND filing expected in Q3 2025.

Key points:

  • SL-172154 showed only modest improvement in median overall survival compared to azacitidine monotherapy benchmarks
  • Approximately 40% workforce reduction as part of restructuring
  • Cash runway extended into 2027
  • Mutual termination of collaboration agreement with Ono Pharmaceutical
  • SL-325 demonstrates high affinity binding and superior efficacy over TL1A antibodies in preclinical studies

Shattuck Labs (Nasdaq: STTK) ha annunciato una priorizzazione strategica del proprio pipeline, interrompendo il programma clinico SL-172154 a causa di modesti miglioramenti nella sopravvivenza globale per i pazienti con AML e HR-MDS con mutazioni TP53. L'azienda si concentrerà su SL-325, un anticorpo antagonista di DR3 di prima classe per la malattia infiammatoria intestinale (IBD), con una richiesta IND prevista per il terzo trimestre del 2025.

Punti chiave:

  • SL-172154 ha mostrato solo un modesto miglioramento nella sopravvivenza globale mediana rispetto ai benchmark della monoterapia con azacitidina
  • Riduzione del personale di circa il 40% come parte della ristrutturazione
  • Fondo cassa esteso fino al 2027
  • Terminazione reciproca dell'accordo di collaborazione con Ono Pharmaceutical
  • SL-325 dimostra un'alta affinità di legame e una superiorità di efficacia rispetto agli anticorpi TL1A negli studi preclinici

Shattuck Labs (Nasdaq: STTK) anunció una priorización estratégica de su pipeline, discontinuando su programa clínico SL-172154 debido a mejoras modestos en la supervivencia general para pacientes con AML y HR-MDS con mutaciones TP53. La compañía se enfocará en SL-325, un anticuerpo antagonista de DR3 de primera clase para la enfermedad inflamatoria intestinal (IBD), con una solicitud IND prevista para el tercer trimestre de 2025.

Puntos clave:

  • SL-172154 mostró solo una mejora modesta en la supervivencia global mediana en comparación con los estándares de monoterapia con azacitidina
  • Reducción aproximada del 40% en la fuerza laboral como parte de la reestructuración
  • Prolongación de la duración del capital hasta 2027
  • Terminación mutua del acuerdo de colaboración con Ono Pharmaceutical
  • SL-325 demuestra una alta afinidad de unión y una eficacia superior sobre los anticuerpos TL1A en estudios preclínicos

샤턱 랩스(나스닥: STTK)는 TP53 변이 AML 및 HR-MDS 환자들에 대한 전반적인 생존율 개선이 미미하여 SL-172154 임상 프로그램을 중단하기로 전략적 파이프라인 우선순위를 발표했습니다. 이 회사는 염증성 장 질환(IBD)용 1세대 DR3 길항제 항체인 SL-325에 집중할 것이며, IND 제출은 2025년 3분기로 예정되어 있습니다.

주요 사항:

  • SL-172154는 아자시티딘 단독 치료 기준에 비해 중앙 생존율에서 미미한 개선만을 보여주었습니다.
  • 구조 조정의 일환으로 약 40%의 인력 감축
  • 현금 운용 기간이 2027년까지 연장됨
  • 오노 제약과의 협력 계약 상호 종료
  • SL-325는 전임상 연구에서 TL1A 항체보다 높은 결합 친화도와 우수한 효능을 보여줍니다.

Shattuck Labs (Nasdaq: STTK) a annoncé une priorisation stratégique de son pipeline, mettant fin à son programme clinique SL-172154 en raison d'améliorations modestes de la survie globale des patients atteints de LMA et de MDS-HR avec des mutations TP53. L'entreprise se concentrera sur SL-325, un anticorps antagoniste de DR3 de première classe pour la maladie inflammatoire de l'intestin (MII), avec une demande d'IND attendue pour le troisième trimestre de 2025.

Points clés :

  • SL-172154 n'a montré qu'une amélioration modeste de la survie globale médiane par rapport aux benchmarks de la monothérapie à l'azacitidine
  • Réduction d'environ 40 % de la main-d'œuvre dans le cadre de la restructuration
  • Duration des liquidités prolongée jusqu'en 2027
  • Résiliation mutuelle de l'accord de collaboration avec Ono Pharmaceutical
  • SL-325 démontre une forte affinité de liaison et une efficacité supérieure par rapport aux anticorps TL1A dans des études précliniques

Shattuck Labs (Nasdaq: STTK) hat eine strategische Priorisierung seiner Pipeline angekündigt und das klinische Programm SL-172154 aufgrund bescheidener Verbesserungen der Gesamtüberlebenswahrscheinlichkeit bei TP53-mutierten AML- und HR-MDS-Patienten eingestellt. Das Unternehmen wird sich auf SL-325 konzentrieren, einen Antikörper-Antagonisten der DR3-Klasse für chronisch entzündliche Darmerkrankungen (IBD), mit einer IND-Anmeldung, die für das dritte Quartal 2025 erwartet wird.

Wichtige Punkte:

  • SL-172154 zeigte nur eine bescheidene Verbesserung der medianen Gesamtüberlebenszeit im Vergleich zu den Benchmarks der Azacitidin-Monotherapie.
  • Etwa 40% Stellenabbau im Rahmen der Umstrukturierung
  • Die Liquiditätsreserve wurde bis 2027 verlängert.
  • Gegenseitige Beendigung des Kooperationsvertrags mit Ono Pharmaceutical.
  • SL-325 zeigt eine hohe Bindungsaffinität und überlegene Wirksamkeit gegenüber TL1A-Antikörpern in präklinischen Studien.
Positive
  • Focus on SL-325, a potentially first-in-class DR3 antagonist antibody for IBD treatment
  • Preclinical studies of SL-325 show high affinity binding and superior efficacy over TL1A antibodies
  • Cash runway extended into 2027 due to restructuring
  • IND filing for SL-325 expected in Q3 2025
Negative
  • Discontinuation of SL-172154 clinical program due to modest improvement in overall survival
  • Approximately 40% workforce reduction as part of restructuring
  • Termination of collaboration agreement with Ono Pharmaceutical

Insights

The discontinuation of SL-172154 and shift to SL-325 represents a significant strategic pivot for Shattuck Labs. While disappointing, this decision demonstrates prudent resource allocation given the modest survival improvements observed. The 40% workforce reduction and restructuring should extend the cash runway into 2027, providing ample time to advance SL-325 through Phase 1 trials.

Financially, Shattuck reported $105.3 million in cash and investments as of June 30, 2024. The termination of the Ono Pharmaceutical agreement eliminates potential milestone payments but also removes associated obligations. The focus on SL-325, a potentially first-in-class DR3 antagonist, could offer a higher probability of success in the competitive IBD market.

Investors should note the extended cash runway and the company's ability to fund operations through key clinical milestones for SL-325. While the pipeline shift introduces new risks, it also presents opportunities in the promising TL1A/DR3 pathway. The market's reaction will likely be mixed, balancing disappointment in SL-172154 with cautious optimism for SL-325's potential.

The discontinuation of SL-172154 due to modest survival improvements in TP53 mutant AML and HR-MDS is a setback, but not entirely unexpected given the challenges in these indications. The pivot to SL-325, a DR3 antagonist antibody, is scientifically intriguing. Targeting DR3 instead of TL1A could potentially offer superior efficacy, drawing parallels to the PD-1 vs. PD-L1 blocking strategies in immuno-oncology.

The IBD market presents a significant opportunity, with TL1A/DR3 pathway inhibition showing promise. SL-325's potential as a first-in-class DR3 antagonist could differentiate it in a competitive landscape. The planned IND filing in Q3 2025 provides a clear development timeline.

While the loss of the Ono collaboration is noteworthy, the focus on SL-325 aligns with a streamlined pipeline strategy. The extended cash runway into 2027 should comfortably support the Phase 1 trial of SL-325, providing multiple value-creating milestones. Overall, this strategic shift repositions Shattuck in the autoimmune space with a novel mechanism of action.

– Interim clinical data for SL-172154 in combination with azacitidine in TP53 mutant (TP53m) acute myeloid leukemia (AML) and higher-risk myelodysplastic syndromes (HR-MDS) showed only modest improvement in median overall survival compared to azacitidine monotherapy benchmarks; further development of SL-172154 discontinued –  

– Prioritization to focus on SL-325, a first-in-class antagonist antibody to DR3, the receptor for TL1A, intended for clinical development in inflammatory bowel disease (IBD); IND filing expected in Q3 2025 –

– SL-172154 associated restructuring expected to extend cash runway into 2027 –

– Company to host investor call today at 8:00 AM Eastern Time (ET) –

AUSTIN, TX and DURHAM, NC, Oct. 01, 2024 (GLOBE NEWSWIRE) -- Shattuck Labs, Inc. (Shattuck) (Nasdaq: STTK), a biotechnology company pioneering the development of novel therapeutics targeting tumor necrosis factor (TNF) superfamily receptors for the treatment of patients with cancer and chronic immune-related diseases, today announced a strategic pipeline prioritization to include the discontinuation of its clinical program, SL-172154. The Company will turn its focus to SL-325, its DR3 antagonist antibody, and plans initial clinical development in patients with IBD, where TL1A/DR3 blocking antibodies have demonstrated compelling monotherapy efficacy.

“We are disappointed that the promising complete remission rates we previously shared from our Phase 1 clinical trial did not translate to clinically meaningful improvements in median overall survival for TP53m AML and HR-MDS patients treated with SL-172154 in combination with azacitidine. We thank our clinical team and investigators for conducting an excellent clinical study, yet we must accept this result as it stands and move on to other opportunities with a higher probability of success,” said Taylor Schreiber, M.D., Ph.D., Chief Executive Officer of Shattuck.

Dr. Schreiber continued, “We are announcing a strategic shift to focus on SL-325, a DR3 antagonist antibody designed to achieve a more complete blockade of the clinically validated TL1A/DR3 signaling pathway. We believe SL-325 could be a first-in-class DR3 receptor blocking antibody, and that this approach will prove more potent than blocking TL1A, for many of the same reasons that blocking PD-1 has proven more potent than blocking PD-L1. This strategic shift in our clinical development plans and subsequent realignment of our organization with an approximate 40% reduction in workforce will allow us to use our resources most efficiently to position Shattuck for long-term success. I would like to express my gratitude to the patients who participated in our clinical trials to date as well as to the Shattuck team members who were impacted by this realignment.”

Top-line Phase 1B SL-172154 Clinical Trial Results

HR-MDS

  • Interim Overall Survival (OS) analysis was completed on September 3, 2024.
  • Overall Survival: Current median OS of 15.6 months. The median survival for patients with TP53m HR-MDS is currently 10.6 months and will not improve beyond 13.1 months with subsequent data cuts.
  • Benchmark Data: Benchmark median OS of approximately 9–12 months for TP53m HR-MDS patients treated with azacitidine alone.
  • Safety and Tolerability: No deaths have occurred in patients (n=3) without TP53m. SL-172154 showed a manageable safety profile with Infusion-Related Reactions (IRRs) as the most common SL-172154 treatment-emergent adverse events (TEAEs). 

TP53m AML

  • Interim OS analysis was completed on September 3, 2024.
  • Overall Survival: Current median OS is 10.5 months and will not improve beyond 11.7 months with subsequent data cuts.
  • Benchmark Data: Benchmark median OS of approximately 5-8 months for TP53m AML patients treated with azacitidine alone.
  • Safety and Tolerability: SL-172154 showed a manageable safety profile with IRRs as the most common SL-172154 treatment-emergent adverse events TEAEs. 

Corporate Updates

  • Shattuck to discontinue SL-172154 program and pivot to pipeline compound: Approval of SL-172154 in TP53m AML and HR-MDS would require meaningful improvement in OS in large-scale, randomized studies. The Company saw only modest improvements in OS in its Phase 1 trial and historically some erosion in efficacy would be expected in larger, randomized trials. Given Shattuck’s current resources, the lack of a definitive OS benefit to date, and that no CD47 inhibitor has shown a significant efficacy signal in any indication to date, the Company has chosen to reallocate its resources to drive SL-325 through Phase 1 clinical development.
  • Shattuck and Ono Pharmaceutical Co., Ltd. mutually agree to termination of license agreement: On September 30, 2024, Shattuck and Ono Pharmaceutical Co., Ltd. (Ono) mutually agreed to terminate the Collaboration and License Agreement dated February 13, 2024 (Collaboration Agreement). Under the Collaboration Agreement, Ono and Shattuck were collaborating on preclinical development of certain compounds. Following the mutual termination, Shattuck is no longer required to satisfy any remaining performance obligations and will not receive any future research activity reimbursements or upfront, milestone, or royalty payments from Ono.
  • Shattuck’s lead candidate, SL-325, is a potentially first-in-class DR3 antagonist antibody: SL-325 is a DR3 blocking antibody for the treatment of IBD and other inflammatory autoimmune diseases. In preclinical studies, SL-325 demonstrates high affinity binding, superior efficacy over TL1A antibodies, and offers a data-driven rationalization for targeting the TNF receptor, DR3, versus its ligand, TL1A. Shattuck expects to file an IND for SL-325 in the third quarter of 2025.

Financial Guidance Update

As of June 30, 2024, cash and cash equivalents and investments were $105.3 million.

Shattuck has implemented a restructuring plan to prioritize the development of the Company's DR3 program. The plan is intended to optimize the Company's cost structure by aligning the size and structure of its workforce with the Company's current goals and strategy, following the discontinuation of SL-172154. Approximately 40% of Shattuck’s workforce will be impacted by the changes. The Company expects to complete the reduction in force in the fourth quarter of 2024.

Given the changes to Shattuck’s operations and cost structure, the Company believes its cash and cash equivalents and investments will be sufficient to fund its planned operations into 2027, beyond results from its planned Phase 1 clinical trial of SL-325. This cash runway guidance is based on the Company’s current operational plans and excludes any additional capital that may be received, proceeds from potential business development transactions, and/or additional costs associated with additional development activities that may be undertaken.

Shattuck Labs Investor Call and Webcast

Shattuck will host a conference call and webcast at 8:00 a.m. ET on Tuesday, October 1, 2024, to discuss clinical data from SL-172154 and outline a strategic pipeline prioritization to focus on SL-325, a first-in-class DR3 antagonist targeting the TL1A/DR3 signaling pathway. Participants are invited to listen by dialing (800) 715-9871 (domestic) or +1 (646) 307-1963 (international) five minutes prior to the start of the call and providing the passcode 6989140. A live webcast presentation will be available here or on the company’s website at www.ShattuckLabs.com under Events & Presentations. A replay of the webcast will be archived on the company’s website following the presentation.

About Shattuck Labs, Inc.

Shattuck Labs, Inc. (Nasdaq: STTK) is a biotechnology company specializing in the development of potential treatments for autoimmune/inflammatory diseases and cancer. Shattuck is developing a potentially first-in-class antibody for the treatment of IBD and other inflammatory autoimmune diseases. Shattuck's expertise in protein engineering and the development of novel TNF receptor agonist and antagonist therapeutics come together in its lead program, SL-325, a first-in-class DR3 antagonist antibody designed to achieve a more complete blockade of the clinically validated TL1A/DR3 pathway. Shattuck has offices in both Austin, Texas and Durham, North Carolina. For more information, please visit: www.ShattuckLabs.com.

Forward-Looking Statements

Certain statements in this press release may constitute “forward-looking statements” within the meaning of the federal securities laws, including, but not limited to, our expectations regarding: plans for our preclinical studies, clinical trials and research and development programs, particularly with respect to SL-325; plans for the realignment of our strategic pipeline and discontinuation of clinical development of SL-172154; the anticipated timing of any regulatory filings for SL-325; the anticipated timing of our preclinical studies and clinical trials for SL-325; the clinical benefit, safety and tolerability of SL-325; the effects of the proposed restructuring and reduction in force on the Company’s results of operations and financial condition; and expectations regarding the time period over which our capital resources will be sufficient to fund our anticipated operations. Words such as “may,” “might,” “will,” “objective,” “intend,” “should,” “could,” “can,” “would,” “expect,” “believe,” “design,” “estimate,” “predict,” “potential,” “develop,” “plan” or the negative of these terms, and similar expressions, or statements regarding intent, belief, or current expectations, are forward-looking statements. While we believe these forward-looking statements are reasonable, undue reliance should not be placed on any such forward-looking statements, which are based on information available to us on the date of this release. These forward-looking statements are based upon current estimates and assumptions and are subject to various risks and uncertainties (including, without limitation, those set forth in our filings with the U.S. Securities and Exchange Commission (SEC)), many of which are beyond our control and subject to change. Actual results could be materially different. Risks and uncertainties include: global macroeconomic conditions and related volatility, expectations regarding the initiation, progress, and expected results of our preclinical studies, clinical trials and research and development programs; expectations regarding the timing, completion and outcome of our clinical trials; the unpredictable relationship between preclinical study results and clinical study results; the timing or likelihood of regulatory filings and approvals; our expectations regarding the overall benefit of the strategic prioritization of our pipeline; liquidity and capital resources; and other risks and uncertainties identified in our Annual Report on Form 10-K for the year ended December 31, 2023, and subsequent disclosure documents filed with the SEC. We claim the protection of the Safe Harbor contained in the Private Securities Litigation Reform Act of 1995 for forward-looking statements. We expressly disclaim any obligation to update or alter any statements whether as a result of new information, future events or otherwise, except as required by law.

The Company intends to use the investor relations portion of its website as a means of disclosing material non-public information and for complying with disclosure obligations under Regulation FD.

Investor & Media Contact:
Conor Richardson
Vice President of Investor Relations
Shattuck Labs, Inc.
InvestorRelations@ShattuckLabs.com


FAQ

Why did Shattuck Labs (STTK) discontinue the SL-172154 clinical program?

Shattuck Labs discontinued the SL-172154 clinical program due to modest improvements in overall survival for TP53 mutant AML and HR-MDS patients compared to azacitidine monotherapy benchmarks in their Phase 1 trial.

What is Shattuck Labs' (STTK) new focus after discontinuing SL-172154?

Shattuck Labs is now focusing on SL-325, a first-in-class DR3 antagonist antibody designed for the treatment of inflammatory bowel disease (IBD) and other inflammatory autoimmune diseases.

When does Shattuck Labs (STTK) expect to file an IND for SL-325?

Shattuck Labs expects to file an Investigational New Drug (IND) application for SL-325 in the third quarter of 2025.

How has Shattuck Labs' (STTK) cash runway been affected by the restructuring?

The restructuring and pipeline prioritization have extended Shattuck Labs' cash runway into 2027, beyond the expected results from the planned Phase 1 clinical trial of SL-325.

Shattuck Labs, Inc.

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