ERBB2 and gastric cancer: Based on the assumption that the pathological judgment of mixed-type gastric cancer with intestinal phenotype features is good, after weighing and selecting different judgment criteria for sensitivity and specificity, we believe that the specificity and sensitivity of HER2-SRM protein expression detection level are good when judged at 700 amol/μg, with a specificity of 87.5% and a sensitivity of 81.8%.