Following a request from the European Commission, the European Food Safety Authority (EFSA) assessed the findings reported by Trtikova et al. (2015). The relevance of these findings for the risk assessment of maize MON 810 and other Cry1Ab-expressing Bt-maize events for which the EFSA GMO Panel has already issued a scientific opinion was also assessed. The publication by Trtikova et al. (2015) does not reveal any new information that would invalidate the previous conclusions and risk management recommendations made on maize MON 810 or any other Cry1Ab-expressing Bt-maize events previously assessed by the EFSA GMO Panel. Therefore, EFSA considers that the previous GMO Panel risk assessment conclusions and risk management recommendations on all Cry1Ab-expressing Bt-maize events so far, including the only cultivated crop in the European Union, maize MON 810, remain valid and applicable.