In vitro genotoxicity testing strategy for nanomaterials and the adaptation of current OECD guidelines

► We consider current in vitro OECD genotoxicity tests for nanomaterials. ► Ames test does not appear to be suitable for nanomaterial assessment. ► In vitro HPRT and micronucleus assays require nanomaterial specific protocols. ► We recommend a strategic in vitro genotoxicity testing strategy for nanomaterials.