Expression and significance of OR2W3 in gastric adenocarcinoma

Objective To detect and analyze the expression and significance of olfactory receptor family 2 subfamily W member 3 (OR2W3) in gastric adenocarcinoma, and to explore its correlation with cell proliferation and apoptosis. Methods From January 2013 to June 2014, 61 patients with gastric adenocarcinoma diagnosed in the Affiliated Hospital of North China University of Technology and undergoing radical operation were selected as the study subjects.Neoplasm tissue were selected as the observation group, normal gastric mucosa(61 cases) were selected as the control group.Immunohistochemistry was used to detect the expression of or2w3 and HER-2 in the two groups.Fish was used to detect the amplification of HER-2 gene in some of the patients with uncertain expression of HER-2.Western blot was used to detect the expression of PCNA and BAX in the observation group. Results Positive rate of OR2W3 was higher in the observation group(50.8%, 31/61) than that in the control group(8.2%(5/61)), and the difference between the two groups was statistically significant(χ2=26.63, P<0.05). The difference of the positive rate of OR2W3 in the maximum diameter(≥6 cm was 68.8%(22/32), <6 cm was 31.0%(9/29)), depth of invasion(seroas and beyond was 63.4%(26/41), less serosa was 25.0%(5/20)), vascular and lymphatic vessel involvement(involvement was 78.6%(11/14), no involvement was 42.6%(20/47)), lymph node metastasis(metastasis was 82.1%(23/28), no metastasis was 24.2%(3/33)) and TNM staging(Ⅲ+ Ⅳ was 78.1%(25/32), Ⅰ+ Ⅱ was 20.7%(6/29)) in observation group was statistically significant(χ2 was 8.423, 7.937, 5.559, 20.318, 20.080, respectively, all P<0.05). Expression of OR2W3 was correlated with survival time(X2=5.31, P<0.05). Positive correlation was found between OR2W3 and PCNA expression(r=0.54, P<0.05). Negative correlation were found between OR2W3 and BAX expression(r=-0.59, P<0.05). There were 8 cases of HER-2 positive and 53 cases of HER-2 negative.The difference of OR2W3 expression in tumors with different HER-2 expression was statistically significant (χ2=4.957, P<0.05). Conclusion The expression of OR2W3 in gastric adenocarcinoma tissue is significantly increased, which can promote the proliferation of cancer cells and inhibit apoptosis.OR2W3 is related to HER-2 expression.Detection of OR2W3 expression may be of some value in judging prognosis. Key words: Gastric adenocarcinoma; OR2W3; Proliferation; Apoptosis; Prognosis