Saphnelo Use in Females of Child-bearing Potential

Research Questions: 1. What is the incidence and prevalence of anifrolumab use among females of reproductive potential in selected countries where anifrolumab is marketed? 2. What are the baseline characteristics and drug utilization patterns in females of reproductive potential who initiate treatment with anifrolumab in selected countries where anifrolumab is marketed? Primary Objectives: 1a. To describe trends in the annual incidence of anifrolumab utilization among females of reproductive potential overall and stratified by age group and, separately, by SLE diagnosis status. 1b. To describe trends in the annual prevalence of anifrolumab utilization among females of reproductive potential overall and stratified by age group and, separately, by SLE diagnosis status. Secondary Objectives: 2\. To describe the demographic and clinical characteristics of females of reproductive potential who initiate anifrolumab use, at the point of treatment initiation. 3\. To describe SLE treatment regimens at anifrolumab initiation among females of reproductive potential with an SLE diagnosis. 4\. To describe anifrolumab utilization patterns among females of reproductive potential who initiate anifrolumab use. 5\. To enumerate and describe pregnancies with anifrolumab exposure among females of reproductive potential who initiate anifrolumab use. This is a non-interventional, retrospective, descriptive cohort study using secondary healthcare data from selected countries where anifrolumab is marketed (specifically, Denmark, France, Germany, and the US) to assess trends in, and patterns of, anifrolumab use among females of reproductive potential. The study population for the primary objectives will be female patients of reproductive potential (defined as females aged 15 to 50 years old) who are observable during the patient identification period (country-specific; market launch date through the end of available data). The study population for the secondary objectives will be female patients of reproductive potential who newly initiated anifrolumab use during the patient identification period. Secondary Objective 3 is restricted to female patients of reproductive potential who initiate anifrolumab use and have a prior record of SLE diagnosis. Study populations will be identified separately within each country-specific secondary healthcare data source from Denmark, France, Germany, and the US. Final study report delivery is planned for April 2032.