INTERSTELLAR is a multi-country, single-arm, observational, cohort study, with 1 year retrospective baseline data and 1 year of prospective follow-up. The study will be initiated on a country-by-country basis following the commercial launch of anifrolumab. The enrolment period is anticipated to be 12 months per country. In general, patients will enter the study between the first anifrolumab prescription and infusion (index), with follow-up until death, loss to follow-up, patient discontinuing the study, or end of study period (whichever occurs first). Relevant clinical and patient reported outcome (PRO) data collection for the entire follow up will continue for patients who have discontinued anifrolumab during the study, unless the patients have withdrawn their consent for participation in the study
