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Recursion's AI-Discovered Drug REC-4881 Shrinks Colon Polyps 53% in Early Trial

Recursion Pharma says its AI-discovered oral candidate REC-4881 produced sustained reductions in colon polyp burden for patients with familial adenomatous polyposis. Nine of 11 trial participants experienced a median 53% drop in total polyp burden measured 12 weeks after stopping treatment, following earlier data showing a 43% decline during therapy. The Nvidia-backed company will expand adult enrollment and plans to consult the U.S. regulator in H1 2026 about a potential pivotal study. These are encouraging early results that need confirmation in larger trials.

Recursion Pharma, a Salt Lake City–based biotech backed by Nvidia, reported promising early results for its AI-discovered oral candidate REC-4881 in patients with familial adenomatous polyposis (FAP), a rare inherited disorder that produces numerous colon polyps and increases colorectal cancer risk.

Key Results

In an early- to mid-stage clinical trial, 9 of 11 patients maintained a durable reduction in total polyp burden, with a median decrease of 53% measured 12 weeks after discontinuing therapy. Preliminary data released in May showed a 43% reduction in polyp burden at 13 weeks on treatment among six patients.

Why This Matters

If confirmed in larger studies, an effective oral therapy like REC-4881 could reduce or delay the need for colectomy (surgical removal of the colon), a common preventive intervention for people with FAP to lower colorectal cancer risk.

Najat Khan, incoming CEO: "This is the first clinical validation of Recursion's AI platform, where we garnered unbiased insights to know that this molecule could work in this disease and now proving it in patients with this latest data."

Next Steps

Recursion plans to expand the study to a broader adult population (age 18 and older) and expects to engage the U.S. health regulator in the first half of 2026 to define a potential registration pivotal study pathway. The company said its shares rose about 6% in premarket trading following the announcement.

These results represent an early clinical validation of an AI-driven discovery approach, but larger, controlled trials are required to confirm safety, durability and clinical benefit.

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