Final Guide on Placebos/Blinding in Cancer Trials
FDA has released a final guidance entitled “Placebos and Blinding in Randomized Controlled Cancer Clinical Trials for Drug and Biological Products.” The document provides recommendations to industry about placebos and blinding in development programs for products to treat hematologic malignancies and oncologic diseases. It does not address the statistical analyses that can be considered when data are unblinded in such trials.
The guidance says that because of the toxicity profile of an active treatment, patients and investigators may infer which treatment patients are receiving, “so using a placebo control may not blind the treatment. For patients with hematologic malignancies and oncologic diseases that have standard effective therapy available, using a placebo (not an active treatment) generally would not be considered ethical, so an active control trial should be conducted. One such active control superiority trial design option is to conduct an open-label trial with a physician’s choice of one of a few standard therapies as the comparator. In open-label comparative trials for which investigator bias may be of concern, a blinded central independent review of scans may mitigate bias regarding endpoint assessment. Another option has been to compare the investigational drug product with the placebo, with each added to the standard of care (an add-on trial).”