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Katsuyuki Fukutake,1,2 Kanae Togo,3 Linghua Xu,3 Leona E Markson,4 José Maria Jimenez Alvir,5 Ian Winburn,6 Toshiyuki Karumori3 1Laboratory Medicine, Tokyo Medical University, Shinjuku, Tokyo, Japan; 2Department of Blood Coagulation Diseases, Ogikubo Hospital, Suginami, Tokyo, Japan; 3Pfizer Japan Inc, Shibuya-ku, Tokyo, Japan; 4Pfizer Inc, Collegeville, PA, USA; 5Pfizer Inc, New York, NY, USA; 6Pfizer Ltd, Surrey, UKCorrespondence: Toshiyuki Karumori, Pfizer Japan Inc, Shinjuku Bunka Quint Bldg, 3-22-7, Yoyogi, Shibuya-ku, Tokyo, Japan, Tel +81-80-4152-4243, Email Toshiyuki.karumori@pfizer.comIntroduction: Until extended half-life (EHL) factor IX (FIX) concentrates became available in Japan in 2010, patients with hemophilia B received intravenous FIX replacement therapy with standard half-life (SHL) FIX concentrates.Purpose: To investigate the amount of factor dispensed and the associated medical expenditures for the treatment of hemophilia B in the real-world clinical setting in Japan.Methods: This retrospective study comprised patients with hemophilia B (N=197) who had filled prescriptions for FIX concentrates reported in Japan’s Medical Data Vision database from 2015 to 2019. Patients were included if they had 2 or more prescriptions for the same FIX concentrates within the first 6 months of the study period and the interval between prescriptions was at least 2 weeks.Results: Since 2015, there was a decrease in the proportion of patients using SHL FIX concentrates and a corresponding increase in international units of dispensed EHL FIX concentrates. Median annualized dispensed dosages (IU/kg body weight) of EHL FIX concentrates were lower than for SHL concentrates for outpatient use only. Annual total health care expenditures per patient and annual expenditures for prescribed FIX concentrates increased each year during the study period. Following a switch from an SHL to an EHL concentrate, the median amount of prescribed FIX concentrate decreased slightly, al

Introduction: With the development of gene therapy for people with haemophilia (PWH), it is important to understand how people impacted by haemophilia (PIH) and clinicians prioritise haemophilia treatment attributes to support informed treatment decisions. Objective: To examine the treatment attribute preferences of PIH and clinical experts in the United Kingdom (UK) and to develop a profile of gene therapy characteristics fit for use in future discrete choice experiments (DCEs). Methods: Semi-structured interviews were conducted with PIH (n = 14) and clinical experts (n = 6) who ranked pre-defined treatment attributes by importance. Framework analysis was conducted to identify key themes and treatment attributes; points were allocated based on the rankings. Synthesis of results by a multidisciplinary group informed development of a profile of gene therapy characteristics for use in future research. Results: Key themes identified by PIH and clinical experts included patient relevant features and the importance of ‘informed decision making'. The six top-ranked treatment attributes were ‘effect on factor level’ (79 points), ‘uncertainty regarding long-term risks’ (57 points), ‘impact on daily life’ (41 points), ‘frequency of monitoring’ (33 points), ‘impact on ability to participate in physical activity’ (29 points), and ‘uncertainty regarding long-term benefits’ (28 points). The final treatment characteristics were categorised as therapeutic option, treatment effectiveness, safety concerns, impact on self-management and quality of life (role limitations). Conclusion: We identified several gene therapy characteristics important to PIH and clinicians in the UK. These characteristics will be used in a future DCE to further investigate patient preferences for gene therapy., IMI-PREFER