EGFR and neoplasm: A total of 5/9 patients had identical EGFR mutations at multiple sites within the primary tumour and corresponding metastases; however, 2/9 patients presented with two different variants of Exon 19 deletions within the primary tumour: 1/9 patients had a mixture of wild-type EGFR and EGFR Exon 19 deletions; and 1/9 patients carried both L858R mutations and Exon 19 deletions.