EGFR and neoplasm: Sixteen tumor samples (11.27%) were positive for EGFR mutations (seven different types of EGFR mutation were found: one in exon 18, four in exon 19 and two in exon 21) and 47 (33.10%) tumor samples were positive for KRAS mutations (seven different types of KRAS mutations were found: five in codon 12 and two in codon 13).