Abstract: ObjectiveTo investigate the expression of Notch1, Deltalike ligand 4 (DLL4), hairy and enhancer of split1 (HES1), microvessel density (MVD), lymphatic vessel density (MLD) in gastric carcinoma, so as to discuss their roles in the development of gastric carcinoma. MethodsGastric carcinoma, paracancer tissues which was apart from the edge of cancer tissue >60 mm obtained during operation and normal gastric mucosa obtained during gastroscopy were used as controls. All specimens were made tissue microarray. The expressions of Notch1, DLL4, HES1 were detected by immunohistochemistry. Immunohistochemical double taining was used to detect MVD and MLD. The relationships between Notch1, DLL4, HES1 expression and angiogenesis, lymphangiogenesis and their significances were analyzed. ResultsThe positive rate of Notch1 in gastric carcinoma was 48.30%, significantly higher than that of paracancerous (25.00%，χ2=6.38, P<0.05) and control group (16.67%，χ2=10.18, P<0.05). The differences of the positive rate of DLL4 in gastric carcinoma (55.94%), paracancerous (45.70%) and control group (56.67%) were not significant (χ2=1.18, P>0.05; χ2=0.005, P>0.05). The differences of the positive rate of HES1 in gastric carcinoma (36.64％), paracancerous (34.40%) and control group (33.33%) were not significant (χ2=0.05, P>0.05; χ2=0.11, P>0.05). The mean of MVD in gastric carcinoma group was 28.84±14.17, which was significantly higher than that in paracancerous group (17.02 ±8.54, t=4.03, P<0.05) and control group (16.69±7.21, t=5.01, P<0.05). The mean of MLD in gastric carcinoma group was 8.55±4.98, which was significantly higher than that in paracancerous group (4.05±2.48, t=9.30, P<0.05) and control group (3.99±1.56, t=10.32, P<0.05). The expression of DLL4 was correlated with MVD (t=2.77, P<0.05), but wasn′t correlated with MLD (t=1.89, P>0.05). There were no correlations between the expression of Notch1, HES1 and tissues MVD, MLD (P>0.05). ConclusionNotch1 plays important roles in the development of gastric carcinoma. There are many angiogenesis and lymphangiogenesis in gastric carcinoma. The expression of DLL4 in gastric carcinoma has certain effect in the formation of microvessel.

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