ERBB2 and neoplasm: The results demonstrated that OSCC cells grew more quickly in medium containing 20% inactivated plasma than 20% normal plasma (p = 1.39 × 10−8 for CAL27 cells, p = 3.29 × 10−14 for SCC15 cells and p = 3.02 × 10−16 for SCC25 cells) (Figures 3J–L), suggesting that anti-tumor effects of natural anti-HER2 IgG autoantibodies were mediated through the CDC pathway.