ERBB2 and gastric cancer: Finally, d16HER2 expression (scores of 1 to 3) was observed in 6 HER2-positive GC patient-derived xenografts (PDXs) (Fig. 4C,F) bearing reactivity for CRHER2 (Fig. 4A,D) and WTHER2 probes (Fig. 4B,E and Supplementary Table S2).