HMOX1 and gastric carcinoma: Immunohistochemical expression scores for NGF (p = 0.003) and HO1 (p < 0.001) were significantly higher in gastric carcinomas (mean ± standard error: NGF; 3.1 ± 0.3, HO1; 4.5 ± 0.2) compared with normal gastric mucosa (mean ± standard error: NGF; 0.9 ± 0.4, HO1; 1.0 ± 0.3) (Fig. 1c).