ERBB2 and neoplasm: Interestingly, tumor progression analysis revealed higher levels of PB-infiltrating MDSCs in AEG patients with advanced vs. early-stage disease, HER 2− vs. HER2+, and primary resected malignancies vs. neoTx (p < 0.01, p < 0.01, p < 0.0001, respectively; Figures 4A, D, E).