EGFR and neoplasm: Critically, we identified n = 4 EGFR mutations (EGFR c.2126A>C, EGFR c.2303G>T, EGFR c.2432C>T and EGFR c.2573T>G) in three individuals that were present in PFPE tumour FNA preparations but not identified in the FFPE comparator FNA samples.