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Redx presents Phase 1 data supporting RXC008 as a novel and well tolerated drug candidate in development for the potential treatment of fibrostenotic Crohn’s disease

May 6, 2025 – Biotechnology, Clinical Trials, Drug Discovery, Other, Pharmaceutical – Redx Pharma, clinical trials, fibrosis, fibrostenotic Crohn's Disease, inflammatory bowel disease, small molecules

Orally administered pan-ROCK inhibitor demonstrated intestinal tissue exposure and target engagement with minimal plasma concentrations
A Phase 2 study is being planned.

6 May 2025 — Alderley Park, UK — Redx Pharma, the clinical-stage, small molecule biotechnology company focused on tackling fibrosis, today announces the presentation of additional results from an RXC008 Phase 1 clinical trial. The poster will be presented by Dr Florian Rieder, Vice Department Chair, Co-Section Director Inflammatory Bowel Diseases, Director Cleveland Clinic Program for Global Translational Inflammatory Bowel Diseases, Cleveland Clinic, USA, at Digestive Disease Week 2025, San Diego, CA & Online, Sunday 4 May, 2025.

RXC008 is a highly potent pan-Rho-associated coiled-coil kinase (pan-ROCK) inhibitor that was designed to be restricted to the gastrointestinal (GI) tract. The Phase 1 study aimed to assess the safety, tolerability, local and systemic exposure of RXC008 in healthy participants as part of a clinical development programme for intestinal fibrosis, such as that associated with Crohn’s disease.

The study demonstrated that RXC008 was well tolerated with no safety signals at any tested dose (up to 1000mg as a single oral dose and up to 300mg dosed daily over 14 days). There were no adverse events (AEs) reported in the single ascending dose (SAD) study. In the multiple ascending dose (MAD) study, all AEs were mild or moderate with no trends observed. There were no serious adverse events and no AEs leading to treatment discontinuation. Importantly, no hypotension or tachycardia (known liabilities of systemic pan-ROCK inhibition) were observed in any participant.

Robust data was generated during the study that confirmed the drug to be gut-restricted. Minimal systemic exposure was observed even at daily RXC008 doses of 300mg, when predicted efficacious concentrations of RXC008 were detected in tissue samples obtained from healthy participants ileum and colon via ileocolonoscopy at Day 14 during the MAD section of the trial. The study also confirmed a potential target engagement marker that can be taken forward into the clinic.

Dr Florian Rieder, M.D., Vice Department Chair, Co-Section Director Inflammatory Bowel Diseases, Director Cleveland Clinic Program for Global Translational Inflammatory Bowel Diseases, Cleveland Clinic, USA, said: “The results of this Phase 1 study for RXC008 further demonstrates the first-in-class potential for a novel treatment for fibrostenotic Crohn’s disease. It is very reassuring to see data that demonstrates RXC008 is well tolerated in healthy volunteers with early signs of a target engagement marker identified.“

Dr Helen Timmis, Interim Chief Medical Officer at Redx Pharma added: “Our ambition at the start of this study was to confirm the compound was well tolerated with good tissue exposure and minimal systemic exposure. It’s exciting to have confirmed this as well as confirming a potential target engagement marker. It’s a fantastic position to be in ahead of commencing a Phase 2 study later this year.”

A copy of the abstract presentation deck is available on the Company website at: https://www.redxpharma.com/scientific-publications.

About Redx Pharma Limited

Redx Pharma is a clinical-stage biotechnology company focused on the development of novel, small molecule, targeted medicine for the treatment of fibrotic disease. Redx aims to progress its programmes to clinical proof of concept before evaluating options for further development and potential value creation. The Company is currently progressing an industry-leading ROCK inhibitor portfolio through the clinic, comprising of zelasudil, a selective ROCK2 inhibitor for the treatment of interstitial lung diseases including idiopathic pulmonary fibrosis, and RXC008, a GI-restricted pan-ROCK inhibitor for the treatment of fibrostenotic Crohn’s disease. Additionally, the Company has a Phase 2 precision oncology programme which it intends to partner for further development. The Company has a strong track record of discovering new drug candidates through its core strengths in medicinal chemistry, translational science and clinical development, enabling the Company to discover and develop differentiated therapeutics against biologically or clinically validated targets. To date, six Redx discovered molecules have been progressed into the clinic with the Company’s accomplishments evidenced not only by its wholly-owned clinical-stage product candidates and discovery pipeline, but also by its strategic transactions, which include the sale of pirtobrutinib (RXC005, LOXO-305), the only non-covalent or reversible BTK inhibitor, now approved by the US FDA, and transactions with both AstraZeneca and Jazz Pharmaceuticals. Visit: www.redxpharma.com.