The study examines real-world treatment patterns for Sézary syndrome (SS) in the US from 2018 to 2020, identifying increased use of systemic treatments, particularly mogamulizumab, and variations in treatment patterns across states. The COVID-19 pandemic impacted treatment selection, with a notable drop in ECP and oral systemic therapies in Q2 2020. Despite limitations in data source and completeness, the findings highlight the complexity of therapeutic decision-making for SS.