Figure 1: Examples of microsatellite instability (MSI) were detected in gastric lymphoma patients by high-resolution fluorescent microsatellite analysis. (A) Representative case of a MSI on D5S346. MSI is seen an unequivocal extra peak shift in gastric lymphoma (L) (arrow) compared with normal mucosa(N). (B) Representative case of MSI on D17S250. MSI is characterized by the appearance of multiple drastic additional alleles in gastric lymphoma (arrows) compared with normal mucosa (N).