Ataraxis Real-World Clinical Outcomes Registry Linking AI-Based Pathology Scores to Patient Outcomes

The Ataraxis Real-World Clinical Outcomes (ARC) registry is a prospective, multi-site, non-interventional, observational registry designed to capture short- and long-term clinical outcomes of patients who undergo Ataraxis testing as part of routine clinical care. Ataraxis tests generate prognostic and predictive scores from digitized hematoxylin and eosin (H\&E)-stained pathology slides and baseline clinical variables. Treatment is at the discretion of the treating physician in accordance with standard of care, and participation in the registry does not change or influence treatment selection.

Following enrollment, clinical data will be collected at multiple time points for up to 10 years. Data will be captured in Ataraxis AI's Portal.

Enrollment is planned over approximately two years, with follow-up extending up to 10 years per participant. Approximately 1,000 participants will be enrolled across participating U.S. sites.

Objectives:

* Establish a large-scale, multi-site registry of patients receiving Ataraxis tests, linking test results with short- and long-term clinical outcomes to evaluate their real-world prognostic and predictive performance and clinical utility * Evaluate the performance and clinical utility of Ataraxis tests across diverse patient populations, including molecular subtypes, treatment regimens, and demographic and geographic strata * Leverage the adaptable registry infrastructure to support downstream independent research by contributing site-investigators