CBP-307

CBP-307 is an orally available, next generation small molecule modulator of the sphingosine-1-phosphate 1 receptor (S1P1), a G-protein coupled receptor (GPCR) that plays a central role in regulating T cell movement and is a validated therapeutic target.

Target Indications

Ulcerative colitis (Phase 2)

Ulcerative colitis (UC) is a common form of inflammatory bowel disease (IBD) that causes chronic inflammation of the large intestine. It is estimated that in 2015 there were 3.1 million U.S. adults with a diagnosis of IBD.As of 2016, UC was slightly more prevalent that CD in North America.2

Current treatment options include systemic corticosteroids and immunosuppressants, injectable biologics and surgery.3 While these treatments provide benefit, significant unmet need remains. We believe that CBP-307 has the potential to improve care outcomes for patients with UC by providing improved safety, efficacy and ease of administration compared with currently available therapies.

Crohn’s disease (Phase 2)

Crohn’s disease (CD) is an inflammatory bowel disease (IBD) that causes chronic inflammation of any site in the gastrointestinal tract, but most commonly affects the small intestine and beginning of the large intestine. It is estimated that in 2015 there were 3.1 million U.S. adults with a diagnosis of IBD.In North America, CD has a slightly lower prevalence than Ulcerative colitis, which is the other type of IBD.2

Current treatment options include systemic corticosteroids as first-line therapy and a variety of biologics as second- and third-line therapy.4 There is significant need for orally available therapies that can safely and effectively address unmet need for patients with Crohn’s disease, especially those with severe disease.5

Mechanism of Action

S1P1 mediates the transit of T cells from lymph nodes into circulation and, as a result, the migration of T cells to tissues to release inflammatory mediators.6-10 CBP-307 causes T cells to internalize S1P1, trapping T cells inside the lymph nodes and preventing them from migrating to sites of inflammation.CBP-307 has high potency and selectivity11 and is designed to be the most potent modulator of the S1P1 drug class, if approved. CBP-307 has no significant activity for S1P3, a receptor subtype with known safety concerns, and significantly lower potency for S1P4 and S1P5 than S1P1.

CBP-307 is not a pro-drug and does not require conversion to an active form in the human body following administration.

Phase 1 Clinical Data

In a Phase 1 trial in healthy volunteers, dosing of 0.25 mg of CBP-307 in six healthy adults led to a 75% reduction in circulating lymphocytes at day 14. Once daily doses of up to 0.25 mg of CBP-307 were generally well-tolerated. Upon completion of dosing, the levels of lymphocytes returned to baseline within one week. This could minimize the period of being immunocompromised following CBP-307 treatment, potentially reducing the risk of patients developing infections.

Current Development Status

CBP-307 is currently being evaluated in a global Phase 2 clinical study in patients with moderate to severe ulcerative colitis. Exploratory assessments from a small cohort of patients with moderate to severe Crohn’s Disease (CD) have demonstrated clear evidence of biological activity with reductions from baseline at week 12 for both biomarkers of disease activity including Faecal Calprotectin (FCP) and a clinical endpoint, the Crohn’s Disease Activity Index Score (CDAI). We intend to initiate a global clinical trial in CD.

  1. Dahlhamer JM, Zammittie EP, Ward BW, et al. Prevalence of Inflammatory Bowel Disease Among Adults Aged >18 Years – United States, 2015. MMWR. 2016;65(42):1166-1169.
  2. Hanauer SB. Advances in IBD. Gastroentrerology & Hepatology. 2016;12(11):704-707
  3. Kobayahsi T, Siegmund B, Le Berre C, et al. Ulcerative Colitis. Nature Reviews: Disease Primers. 2020;6:74.
  4. Montiel-Martinez MP, Casis-Herce B, Masdeo-Gonzalez, et al. Pharmacologic Therapy for Inflammatory Bowel Disease Refractory to Steroids. Clinical and Experimental Gastroenterology. 2015;8:257-269.
  5. Crohn’s Disease: Dynamic Market Forecast to 2026 (GlobalData, October, 2018).
  6. Gilenya US PI. https://www.novartis.us/sites/www.novartis.us/files/gilenya.pdf
  7. Mayzent US PI. https://www.novartis.us/sites/www.novartis.us/files/mayzent.pdf
  8. Zeposia US PI. https://packageinserts.bms.com/pi/pi_zeposia.pdf
  9. Sandborn, W J et al. Ozanimod Induction and Maintenance treatment for Ulcerative Colitis. https://www.nejm.org/doi/full/10.1056/NEJMoa1513248
  10. Krause, A. et al. Modeling clinical efficacy of the S1P receptor modulator ponesimod in Psoriasis. Journal of Dermatological Science 89 (2018) 136–145
  11. Connect Biopharma CBP-307 Investigator Brochure (Ed. 5.0). January 2020 [Charter N. Potency and selectivity of CBP-307 on S1P receptors. DiscoveRx Corporation, California, 2015. Study No.: SCB001