Cloudbreak Therapeutics’ Products in U.S. Clinical Trial

Phase II Study to Evaluate the Efficacy and Safety of CBT-001 in Patients with Pterygium

Condition: Hyperemia Reduction and Pterygium Regression

Phase: Phase II

The objective of the study was to evaluate the safety, efficacy, and pharmacokinetics of CBT-001 ophthalmic solutions (0.02%, 0.05% and 0.2%) in reducing pterygium vascularity and inhibiting legion growth. CBT-001 administered three time daily (TID) for 4 weeks had an acceptable safety profile when used in pterygium patients. CBT-001 administered TID for 4 weeks was more effective than the vehicle in reducing pterygium vascularity and inhibiting legion growth.


Study Design

Cloudbreak Therapeutics graph of CBT-001 clinical trials stages 1 and 2

Please visit clinical website to learn more about CBT-001 trial, and our Patient Information page to learn more about pterygium.

Primary Endpoint was Met with Highly Statistical Significance

CBT-001 demonstrates good ocular and systemic safety, quick onset, and highly effective during and post-dosing. 

Baseline demographic characteristics were similar between patients receiving CBT-001 (n=25) and vehicle (n=23). After four (4) weeks of dosing, mean vascularity scores were significantly decreased in patients receiving CBT-001 (-0.8) compared to vehicle (0.0) (p<0.001). Vascularity remained significantly decreased at weeks 8 (p=0.008) and 16 (p<0.001), but not at week 24. The CBT-001 group showed significantly greater mean reductions in lesion length at week 2 (p=0.005), week 4 (p=0.007) and week 8 (p=0.0145).

change in eye health of patient with pterygium due to CBT-001 treatment
Cloudbreak Therapeutics graph of pterygia vascularity mean grade change from baseline

EOP2 Meeting with FDA

Proceed with Phase III Trials after a Successful EOP2 Meeting with FDA Regarding CBT-001 as a Treatment for Pterygium

We had a successful EOP2 meeting with the FDA. The FDA agreed with proceeding to Phase III trials, agreed on Phase III study design and efficacy endpoints, and agreed on CMC, non-clinical, and clinical plan.