Parabilis’ FOG-001 Wins FDA Fast Track for Desmoid Tumors
FDA has granted Parabilis Medicines a fast track designation for FOG-001, a first-in-class inhibitor targeting the β-catenin:TCF interaction, for treating desmoid tumors. The action is based on the company’s early clinical data showing signs of meaningful antitumor activity.
In an ongoing Phase 1-2 study, 12 desmoid tumor patients had received FOG-001 as of the August cutoff, and tumor shrinkage was observed in all evaluable, according to the company. It says the therapy contributed to an 80% objective response rate among those with more than one post-baseline scan. Responses appeared independent of tumor location, prior gamma-secretase inhibitor exposure, or specific APC/CTNNB1 mutations. Parabilis also says there were no reported Grade 4/5 treatment-related events, discontinuations, or high-grade GI or skin toxicities.
Parabilis is also exploring FOG-001 across a range of other Wnt/β-catenin–driven tumors, including adamantinomatous craniopharyngioma, ameloblastoma, salivary gland cancers, and solid pseudopapillary neoplasm, with combination-therapy investigations planned for more complex cancers such as microsatellite-stable colorectal cancer. More data are expected in 2026, it adds.