This literature review is part of the National Research Programme NRP 59 "Benefits and Risks of the Deliberate Release of Genetically Modified Plants". It is one of a total of three such reviews, which are: - Medical Issues Related to Genetically Modified Plants of Relevance to Switzerland - Genetically Modified Crop Production: Social Sciences, Agricultural Economics, and Costs and Benefits of Coexistence - Synthesis and Overview Studies to Evaluate Existing Research and Knowledge on Biological Issues on GM Plants of Relevance to Swiss Environments They aim to distil relevant scientific data from the results of international studies on GMP that could help to shape future research and decision-making processes in Switzerland.