The US Food and Drug Administration is evaluating the potential role of observational studies in demonstrating drug product effectiveness. However, the response to an observational study of Roche Holding AG’s Actemra (tocilizumab) for COVID-19 patients shows the hurdles such studies face in gaining acceptance.
Miguel Hernán, professor of biostatistics and epidemiology at Harvard T.H. Chan School of Public Health, described the study he and...