This prospective cohort study will use qualitative methods, specifically semi structured interviews to evaluate knowledge, beliefs, and attitude about gene therapy in patients 12 years and older with a diagnosis of moderate and severe hemophilia B (≤2% FIX activity only), caregivers/parents and healthcare workers who care for them at St. Jude and other global countries. Participants will be interviewed virtually using an online video-conferencing platform, phone or in person.
Interviews will be performed by experienced qualitative interviewers in the official language of each participating site. Interviews will last approximately 45-60 minutes and will be performed only once. All interviews will be audio recorded and obtained information will be analyzed using semantic content analysis to identify common themes.
