Clinicopathological characteristics such as age, sex, tumor location, histology, tumor grade (based on the TNM classification system for malignant tumors, 7th edition), HER2, HER3, cMET, ARID1A expression, microsatellite status and treatments administered to patients with GC included in the initial methylation panel (n = 61) are shown in Table 1. The gene discussed is ERBB2; the disease is gastric cancer.