Statement on the analysis of data from a 90-day rat feeding study with MON 863 maize by the Scientific Panel on genetically modified organisms (GMO)


Panel on Genetically Modified Organisms
Panel members at the time of adoption
Hans Christer Andersson, Salvatore Arpaia, Detlef Bartsch, Josep Casacuberta, Howard Davies, Lieve Herman, Marc De Loose, Niels Hendriksen, Sirpa Kärenlampi, Jozsef Kiss, Ilona Kryspin-Sørensen, Harry Kuiper, Ingolf Nes, Nickolas Panopoulos, Joe Perry, Annette Pöting, Joachim Schiemann, Willem Seinen, Jeremy Sweet, and Jean-Michel Wal.

The GMO Panel wishes to thank the members of EFSA MON 863 Task Force (Marco Acutis, Billy Amzal, Hubert Deluyker, Claudia Paoletti, Joe Perry, Hilko van der Voet, and Didier Verloo) for the statistical assessment. The GMO Panel is also grateful for information received from Member States.

Statement of the Scientific Committee/Scientific Panel
25. Juni 2007
28. Juni 2007
Last Updated
28. Juni 2007. This version replaces the previous one/s.
European Food Safety Authority (EFSA), Parma, Italy
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No abstract available


In 2004 the Panel on Genetically Modified Organisms (GMO Panel) of the European Food Safety Authority (ESFA) gave its opinion on the safety of MON 863 maize for import and processing, food and feed uses (EFSA, 2004a,b) and released a statement on the same topic shortly after (EFSA, 2004c). In these documents it was concluded that the MON 863 maize would not have an adverse effect on human and animal health or the environment in the context of its proposed use. One of the studies assessed by the Panel was a 90-day (subchronic) feeding study in rats using kernels of MON 863 maize (Monsanto, 2002).

Since then, two scientific papers dealing with this study have been published (Hammond et al., 2006; Séralini et al., 2007).

Hammond et al. (2006) described the study and its outcomes, but in less detail than the original report provided by Monsanto (2002). Séralini et al. (2007) published a statistical re-analysis of the original data from Monsanto and concluded that ‘with the present data it cannot be concluded that GM corn MON 863 is a safe product’. The European Commission asked EFSA on 15 March 2007 to consider, in cooperation with the Member States, what impact the re-analysis might have on the earlier opinions and statement of the GMO Panel (EFSA, 2004a,b,c). In response to the question from the European Commission, EFSA set up a Task Force to assess the statistical methodology applied by Séralini et al. (2007), and to perform an additional statistical analysis. The outcome of the Task Force’ analysis is reported in a document entitled: “EFSA review of statistical analyses conducted for the assessment of the MON863 90-day rat feeding study” (EFSA, 2007). In addition EFSA asked Member States whether there were any further relevant data or views on the Monsanto study and its statistical approach. EFSA also convened a technical meeting with the authors of the paper (Séralini et al. 2007) in order to have a full understanding of their statistical considerations and approaches.

evaluation of the 13-week rat feeding study on MON 863 maize, submitted by the German authorities to the European Commission