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So far, we have received comments on the proposed scientific quality criteria from the Federal Office of Consumer Protection and Food Safety, Germany (BVL) on October 5th, 2016. The comments can be downloaded here.


The G-TwYST research team responded to the BVL comments on November 28th, 2016. The response can be downloaded here.



Members from the GRACE and G-TwYST research teams recently published “Proposed criteria for the evaluation of the scientific quality of rat and mouse feeding trials with whole food/feed derived from genetically modified plants” in Archives of Toxicology. We cordially invite all stakeholders to contribute to further developing these criteria by sending comments.


As one of its tasks G-TwYST developed and proposes criteria to evaluate the scientific quality of 2-year feeding trials. These criteria are now being published in order to trigger a broader discussion in the scientific community an among GMO risk assessment stakeholders. These quality criteria have been developed based on the experience and standards in other toxicity assessment contexts.


The proposed quality criteria are:

  1. The design of the feeding trial is based on internationally recognized test guidelines, but adapted for specific needs of whole food/feed studies and non-targeted testing.
  2. An analysis of the plant materials and diets including, among others, macro- and micronutrients, biological and chemical contaminants as well as the identification and quantification of the event, is performed.
  3. The highest level of the plant material that can be incorporated in the animal diets without leading to a nutritional imbalance is tested.
  4. A non-GM line with a comparable genetic background is used as a control.
  5. Specific aspects regarding the choice and housing of the laboratory animals used in the feeding trials are considered.
  6. Appropriate randomization techniques are applied.
  7. A reliable and appropriate sample collection and processing strategy is implemented.
  8. The staff performing the feeding trial and the analysis of the plant materials, diets and animal samples is “blind” with respect to the identity of the diets.
  9. Appropriate statistical methods are applied to evaluate the power of the study and to analyse the obtained results.



Comments to this and other recently published GRACE papers (http://link.springer.com/article/10.1007/s00204-016-1798-4, http://link.springer.com/article/10.1007/s00204-014-1374-8) can be sent either:

  • to for publication on the GRACE/G-TwYST website. These comments will be put without further peer-review or editorial polishing on our websites. Depending on the nature of the comment, The GRACE and G-TwYST teams will opt for a response at the project website, if deemed necessary. Offending or discrediting comments will not be accepted for publication,
  • directly to Archives of Toxicology. These comments will be answered by the respective project team in form of a Letter to the Editor, if deemed necessary and according to the publication policy of the journal.


Schmidt, K., Döhring, J., Kohl, C. et al. Arch Toxicol (2016) 90: 2287. doi:10.1007/s00204-016-1762-3, http://link.springer.com/article/10.1007/s00204-016-1762-3

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Comments on statistical methods for safety assessment published

March 6, 2018


In safety assessments a large number of non-target effects  has to be analysed statistically. A recent paper published in the Journal of Agricultural and Food Chemistry advocates an approach which leads to over-optimistic conclusions. In a recent Correspondence to this journal the concerns about the misapplication of methodology are explained. See: Safety Assessments and Multiplicity Adjustment: Comments on a Recent Paper, available on the Journal of Agricultural and Food Chemistry website at http://pubs.acs.org/doi/abs/10.1021/acs.jafc.7b03686.

Registration for Final Conference open

1 March, 2018


On April 16, 2018 G-TwYST organises a conference on general conclusions and recommendations from three scientific projects: G-TwYST, GRACE and GMO90+. Registration for this conference is compulsory and can be done by completing the registration form at the G-TwYST website. Registration is open until April 6, 2018.

More information, including a preliminary programme, is available on the G-TwYST Final Conference webpage.