As for the two epidermal growth factor receptors, EGFR and HER2, no correlation was found to be present between the protein expression of the two molecules and histologic subtype, age, gender and tumor size of PTC patients (P = 0.160, 0.179, 0.132, 0.175 for EGFR and P = 0.166, 0.194, 0.151, 0.143 for HER2, respectively). The gene discussed is ERBB2; the disease is neoplasm.