Concerns about data integrity of 30 randomized clinical trials from one author

IntroductionIn 2021, we learnt about the problems in studies on ivermectin and hydrocholoroquine in COVID-19. We noticed an appreciable number of unfunded randomised clinical trials (RCTs) on the treatment of COVID-19 conducted across three centres in Egypt (Tanta University, Assiut University, Ain-shams University) on COVID-19 patients with similar inclusion criteria and overlapping time frames. Dr Sherief M Abd-Elsalam ran seven such RCTs across these three centres; four of these RCTs have since been retracted. We therefore set out to systematically analyse the integrity of all RCTs (co-)authored by Dr Abd-Elsalam, in particular 23 RCTs on Gastroenterology and Hepatology. MethodsWe searched PubMed, Google Scholar, Scopus and clinical trial registries for RCTs published by Dr Sherief M Abd-Elsalam, affiliated with the Department of Tropical Medicine and Infectious Diseases, Faculty of Medicine, Tanta University, Tanta, Egypt. We assessed trial registration, tables for identical data values, statistical errors, and improbable data trends. We assessed the probability of true randomization by assessing baseline characteristics through a Monte Carlo Analysis. ResultsWe report on 30 published randomized control trials (RCTs) of Dr. Sherief Abd-Elsalam, in particular 23 RCTs on Gastroenterology and Hepatology. We found important issues in all RCTs examined. Of these 23 RCTs, 10 RCTs had substantial trial registration inconsistencies. Only one of these 10 RCTs has been retracted to date. We found nine RCTs with substantial statistical mistakes, five RCTs with similarities between tables unlikely to happen by chance, four RCTs with implausible Gaussian distributions, three RCTs in which almost all dichotomous variables had even values, while part of at least one study was plagiarized. Monte Carlo analysis indicated that the probability that distribution of baseline characteristics due to randomisation was 0.0000228. According to the trial registration, Dr. Abd-Elsalam is coordinating 76 clinical trials with 45 trials currently marked as ‘Recruiting’ and 17 trials marked as ‘Unknown Status’ as of November 2022.InterpretationWe strongly recommend a thorough investigation of the data integrity of all RCTs by Dr Sherief M Abd-Elsalam by journal editors. Until the completion of such an investigation, we suggest that none of these studies are used to inform clinical practice.