ERBB2 and neoplasm: Multivariate Cox regression analysis revealed that HER2-low tumor was significantly related to longer OS outcomes compared with HER2-zero tumor (HR, 0.258 [95%CI, 0.087–0.765]; p = 0.015, Supplementary Figure S5), while there was no significant difference between HER2-low and HER2-positive tumors (HR, 0.425 [95%CI, 0.146–1.230]; p = 0.115).