Relationship between let-7a and gastric mucosa cancerization and its significance

Figure 1 Expression let-7a in stomach cancer progression tissue array (in situ hybridization, Nitro-Blue-Tetrazolium/5-bromo-4-chloro-3-indolyl-phosphate staining, original magnification × 200). A: Positive expression (++) of let-7a in gastric tissue; B: Positive expression (+) of let-7a in chronic atrophic gastritis; C: Positive expression (±) of let-7a in gastric carcinoma; D: Negative expression of let-7a in gastric carcinoma.