On May 30, 2025 Parabilis Medicines, a clinical-stage biopharmaceutical company committed to creating extraordinary medicines for people living with cancer, reported the presentations of trial-in-progress posters on the Company’s first-in-human clinical trial evaluating FOG-001, the first and only direct inhibitor of β-cateninTCF4, at the ASCO (Free ASCO Whitepaper) Annual Meeting, which begins on May 30 in Chicago, Illinois, and the ESMO (Free ESMO Whitepaper) Gastrointestinal Cancers Congress 2025, which begins on July 2 in Barcelona, Spain (Press release, Parabilis Medicines, MAY 30, 2025, View Source;cateninTCF4-Inhibitor-at-Upcoming-Medical-Meetings [SID1234653539]).

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FOG-001 is being evaluated in a Phase 1/2 trial (NCT05919264). The multicenter, open-label, non-randomized trial aims to evaluate the safety, tolerability, pharmacokinetics, pharmacodynamics, and antitumor activity of FOG-001 in patients with solid tumors with Wnt pathway activating mutations (WPAM+), including colorectal cancer (CRC) and desmoid tumors.

More than 65 patients with locally advanced or metastatic tumors have been dosed with FOG-001 to date, and early clinical data demonstrate monotherapy antitumor activity and in-tumor target engagement. Phase 1/2 data are expected to be shared publicly in 2025.

The trial is currently enrolling patients with desmoid tumors in its monotherapy arm. It is also enrolling multiple cohorts of microsatellite-stable CRC (MSS-CRC) patients to evaluate combination regimens of FOG-001, supported by strong scientific rationale:

Combinations with FOLFOX+bevacizumab and trifluridine/tipiracil+bevacizumab: Paired biopsy data from the ongoing FOG-001 trial indicate that FOG-001 drives reduction in markers of stemness and upregulation of the angiogenesis pathway, pointing to potentially greater susceptibility to both chemotherapy and bevacizumab. Preclinical studies employing patient-derived xenograft (PDX) mouse models indicate FOG-001 can significantly deepen and extend the benefit of both chemotherapy backbone agent 5-FU and bevacizumab.
A second combination regimen, pairing FOG-001 with PD-1 checkpoint inhibitors, is supported by paired biopsy data from the ongoing trial indicating that FOG-001 induces the Merck tumor inflammation signature in otherwise immunologically "cold" tumors. Preclinical studies in MC38 mouse models suggest this potential, demonstrating synergistic combination efficacy between FOG-001 and PD-1 checkpoint inhibitors. These observations indicate that FOG-001 could improve CRC responses to immunotherapy, which currently has minimal to no monotherapy efficacy in MSS-CRC.
ASCO poster information:

Title: "A Phase 1/2 study of FOG-001, a first-in-class direct β-catenin:TCF inhibitor, in patients with colorectal cancer (CRC) and other locally advanced or metastatic solid tumors"
Abstract Number: TPS3169
Date and Time: June 2, 2025, 1:30-4:30 p.m. CDT
Session: Developmental Therapeutics – Molecularly Targeted Agents and Tumor Biology
Location: Hall A – Posters and Exhibits

ESMO GI poster information:

Title: "FOG-001 – a first-in-class direct β-catenin:TCF inhibitor, in patients with colorectal cancer (CRC) and other locally advanced or metastatic solid tumors: Phase 1/2 study design"
Presentation Number: 145TiP
Date and Time: July 3, 2025, 3:30-4:30 p.m. CET
Session: Poster display session
Location: Foyer

About FOG-001
FOG-001 is an investigational first-in-class competitive inhibitor of β-catenin interactions with the T-cell factor (TCF) family of transcription factors, and is currently in clinical development. By directly targeting the β-cateninTCF4 protein-protein interaction, FOG-001 is intended to block the Wnt signaling pathway irrespective of the various APC and beta-catenin mutations that typically drive disease.

FOG-001 combines key features that distinguish it from previously reported Wnt/β-catenin pathway modulators: FOG-001 acts inside the cell where it binds directly to the key oncogenic driver β-catenin; and FOG-001 blocks the Wnt pathway at the most downstream node, disrupting the interaction between β-catenin and the transcription factor TCF, thereby abrogating the signal transmission by which Wnt pathway mutations are believed to drive oncogenesis. FOG-001 is currently being evaluated in a first-in-human Phase 1/2 clinical trial in patients with locally advanced or metastatic solid tumors.