EGFR and neoplasm: Conflicting results exist regarding the association of EGFR protein expression and EGFR mutations in NSCLC: some studies showed a higher EGFR protein expression in tumor samples (n=133-970) of patients with EGFR mutated (EGFR+) NSCLC (10, 11), while others (n=102-159) showed no association (12, 13).