A new study (Mesnage et al.), using new molecular profiling method, has found that Monsanto's genetically engineered herbicide-tolerant corn event called NK603 is not "substantially equivalent" to non-GM corn. The concept of substantial equivalence is used by Health Canada as a guide in their safety assessments of GM foods. The GM trait NK603 is used in many corn varieties grown across Canada, and ends up in processed food ingredients and animal feed. Health Canada approved the GM corn event called NK603 in 2001.

The new study is: Mesnage R, Agapito-Tenfen S, Vilperte V, Renney G, Ward M, Séralini GE, Nodari N, Antoniou MN. An integrated multi-omics analysis of the NK603 Roundup-tolerant GM maize reveals metabolism disturbances caused by the transformation process. Scientific Reports, 2016; 6:37855. Open access: http://www.nature.com/articles/srep37855