ERBB2 and gastric cancer: According to the more sensitive ERBB2 immunoscoring scheme for GC, four, five, seven, and six tumors with ERBB2 gain had ERBB2 scores of 0, 1+, 2+, or 3+, respectively, and zero, one, six, and seven tumors with ERBB2 amplification displayed ERBB2 scores of 0, 1+, 2+, or 3+, respectively (Figure 1).