ERBB2 and gastric cancer: While high expression of HER2 is reported in many breast, ovarian, and gastric cancer cells [51], medium or low HER2 expression is predicted in a broad range of tissues (including EBOV antigen-positive tissues in infected animals), such as liver, lung, kidney, gastrointestinal tract, heart, skin, and immune-privileged sites such as the brain, eye, and reproductive tract [28, 52, 53].