Mario Saad, based at the University of Campinas in São Paulo, Brazil, has had a string of retractions over the past few years, including four in Diabetes after he lost a legal battle with the American Diabetes Association.
The latest retraction appears in Gastroenterology, citing possible image duplication. Saad is second-to-last author on the 2012 paper.
According to the retraction notice, the journal investigated data in several figures, and believes some were duplicated. The authors explained that the duplications resulted from inadvertently using wrong blots; still, the editors chose to retract the paper after determining they no longer had confidence in its conclusions.
This article has been retracted at the request of the Editor-in-Chief and Deputy Editor-in-Chief following an investigation into the data that were presented in several figures within the article.
A number of images used in this article are believed to be duplicated images. The authors stated that they inadvertently inserted images of the wrong blots in several of the figures, resulting in the duplications; however, they did not address all of the concerns raised. Because the editors were no longer confident in the conclusions of the article based on these incorrect data, a decision was made to retract the paper.
All authors have been notified of this decision. The University of Campinas (UNICAMP) in São Paulo, Brazil was contacted regarding these concerns, but to date the journal has received no response.
The paper, on which Saad is second to last author, has been cited 32 times, according to Clarivate Analytics’ Web of Science.
We contacted Saad, who told us
[I] am not responsible or the correspondent author of this manuscript.
We contacted corresponding author Jose B.C. Carvalheira, also at the University of Campinas, and will update if he responds.
The paper has been questioned on PubPeer. Two years ago, a commenter highlighted possible duplication in several Western blots. Another commenter said he or she contacted the journal to inform the editors of the issues.
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