ERBB2 is widely expressed in epithelial populations of both normal samples (Normal_2, Normal_3, Normal_5, Normal_6, Normal_10, 5/10) and gastric cancer samples (Cancer_1, Cancer_2, Cancer_3, Cancer_4, Cancer_6, Cancer_7, Cancer_8, Cancer_9, and Cancer_10, 9/10) at high levels. The gene discussed is ERBB2; the disease is gastric cancer.