ALK and lung cancer: The National Comprehensive Cancer Network NCCN [23] and International Association for the Study of Lung Cancer/College of American Pathologists/ Association for Molecular Pathology (IASCL/CAP/AMP) guidelines [24] do not recommend ALK mutation testing, while the European Society for Medical Oncology (ESMO) guidelines [25] recommend testing but add that this is not mandatory for treatment decisions.