Real-World Effectiveness of Sotrovimab for the Early Treatment of COVID-19: Evidence from the National COVID Cohort Collaborative (N3C)

N3C IPTW retrospective 4,992 COVID-19 patients in the USA treated with sotrovimab and 541,325 controls, showing lower combined hospitalization or mortality.Confounding by treatment propensity. This study analyzes a population where only a fraction of eligible patients received the treatment. Patients receiving treatment may be more likely to follow other recommendations, more likely to receive additional care, and more likely to receive additional treatments that are not tracked in the data (e.g., nasal/oral hygiene c19early.org, c19early.org (B), vitamin D c19early.org (C), etc.) — either because the physician recommending sotrovimab also recommended them, or because the patient seeking out sotrovimab is more likely to be familiar with the efficacy of additional treatments. Therefore, these kind of studies may overestimate the efficacy of treatments. Efficacy is variant dependent. In Vitro studies predict lower efficacy for BA.1 Liu, Sheward, VanBlargan and a lack of efficacy for BA.2 Zhou. US EUA has been revoked.