This classification stratifies gastric tumors into four subtypes, namely (i) microsatellite instability (MSI), (ii) microsatellite stable/epithelial-mesenchymal transition (MSS/EMT; EMT for short), (iii) microsatellite stable/TP53+, and (iv) microsatellite stable/TP53−. Here, TP53 is linked to gastric neoplasm.