ERBB2 and colorectal carcinoma: Further studies found that IHC-HER2 1+, IHC-HER2 2+, IHC-HER2 (3+), and IHC-HER2 positive (1+, 2+ and 3+) were not related to the prognosis of CRC (P > 0.05), Table 1 and Fig. 3.