ERBB2 and neoplasm: HER2 amplification was not associated with any other clinicopathological characteristics such as age (P = 0.5467), sex (P = 0.7520), tumour stage (P = 0.4495), grade (P = 0.1259), or size (P = 0.4695), or disease-specific survival (P = 0.2502; Table 3).