EGFR and tumor of salivary gland: Taken together, aims of this study were (i) to investigate expression of EGFR in different subtypes of salivary gland tumours, (ii) to define whether overexpression is correlated with the copy number variation of EGFR (amplification of EGFR or polysomy of chromosome 7) or mutation within EGFR gene, (iii) to analyse whether expression of miR-99b, miR-140, and let-7a is different between different salivary gland carcinoma subtypes, and finally (iv) to test whether expression of miR-133b is in correlation with the expression of their target, EGFR, also in salivary gland carcinoma.