ERBB2 and gastric cancer: In this study, we have used the multiplexed CEER platform to determine levels of activated RTKs (HER1, HER2, truncated variants of HER2, i.e., p95HER2, HER3, cMET, PI3K, and IGF1R) in 434 fresh frozen GC tissues and attempted to categorize GC patients into potential subgroups based on their protein pathway activation patterns.