ERBB2 and neoplasm: There were no significant differences in age (49.48 ± 7.00/51.37 ± 6.63), education level (9.12 ± 2.28/8.58 ± 1.97), and KPS score (88.00 ± 4.03/87.58 ± 4.32) between NPD group and PD group (t = −1.528, t = 1.388, t = 0.555, respectively; p > 0.05), were presented as mean ± SD, and there were no significant differences in tumor stage, tumor size, surgical method, pathological type and HER‐2 expression between the two groups (χ2 = 0.697, χ2 = 0.889, χ2 = 0.990, χ2 = 1.656, χ2 = 1.055, respectively; p > 0.05).