EWSR1 and sarcoma: Our optimized method achieved 100% concordance for the HER2 FISH NordiQC - Quality Control 2015 evaluation, 100% concordance for genotyping and clerical accuracy for the sarcoma panel containing CHOP (DDIT3), FUS, EWSR1 and MDM2 in the UK NEQAS International Quality Expertise 2016 evaluation.