The cIMPACT-NOW Working Committee is the Consortium to Inform Molecular and Practical Approaches to CNS Tumor Taxonomy. cIMPACT-NOW was created in late 2016 —following publication of the 2016 Updated 4th Edition of the World Health Organization (WHO) Classification of Tumours of the Central Nervous System— to provide a forum to evaluate and recommend proposed changes to future CNS tumor classifications.
While it is understood that the major impact on international brain tumor classification comes about through the WHO classification update process (cIMPACT-NOW is “Not Official WHO”), it has been hoped that this additional process will “see impact” in selected tumor types and in periods between the WHO classification updates. Thus, cIMPACT-NOW updates are intended to provide possible guidelines for practicing diagnosticians and future WHO classification updates. Since 2017, 4 updates have been published: https://www.intsocneuropathol.com/2019/03/cimpact-now/