HHT

Clinical Study Abstract (Ethics Application) Hereditary hemorrhagic telangiectasia (HHT) is a rare autosomal dominant vascular disorder characterized by recurrent intractable epistaxis and multi-organ arteriovenous malformations. Moderate-to-severe patients often develop refractory anemia with severely impaired quality of life. Current stepwise therapeutic strategies have substantial limitations, including frequent adverse reactions of thalidomide, high recurrence rates after electrocoagulation, and severe surgical trauma, resulting in a lack of safe and individualized treatment options. Our preliminary clinical practice has verified the promising efficacy and long-term benefits of bevacizumab in severe HHT-related epistaxis. However, obvious interindividual variability and occasional adverse events exist, and the underlying mechanism remains unclear. This study aims to systematically evaluate the efficacy and safety of bevacizumab for severe HHT-associated epistaxis, explore the influences of baseline clinical and genetic factors on prognosis, and investigate the mechanism of treatment heterogeneity, so as to optimize individualized therapeutic strategies and provide clinical evidence for precise management of HHT in China.

The goal of this observational study is to create a single macro registry system with data collection on common clinical features, grouping the different rare diseases (RD). Moreover, the specific goals are to generate an alert system for possible cases of RD with data from the electronic medical record, to describe the occurrence of RD in the evaluated population, to characterize the population, to describe patterns of diagnosis and treatment of RD present at the time, and to explore patient-reported outcomes.