First, we grouped gastric carcinomas into four-groups according to the expression types of NGF and HO1 (NGF−/HO1−, NGF+/HO1−, NGF−/HO1+, and NGF+/HO1+) and performed a Kaplan-Meier survival analysis (Fig. 3a). This evidence concerns the gene HMOX1 and gastric carcinoma.