title: The role of SPARC protein expression in the progress of gastric cancer.
abstract: We aimed to investigate the expression of SPARC (secreted protein, acidic and rich in cysteine) in gastric cancer and its relationship with tumor angiogenesis and cancer cells proliferation. Protein expression of SPARC, VEGF, CD34 and Ki-67 in 80 cases of gastric cancer and 30 cases of normal gastric tissue was evaluated by immunohistochemistry. CD34 staining was used as an indicator of microvessel density (MVD). Ki-67 labeling Index (LI) indicated cancer cells proliferation. Statistical analysis was used to investigate its relationship with clinical characteristics, tumor angiogenesis and cancer cells proliferation. SPARC expression was mainly in the stromal cells surrounding the gastric cancer cells, and was statistically significant differences between gastric cancer and normal gastric tissue (P < 0.05). Both the expression of SPARC and VEGF were related to differentiation degree, clinical stage, Lauren classification and lymph node metastasis (P < 0.05). Expression of SPARC was significantly negatively correlated with the expression of VEGF and MVD in gastric cancer tissues. Expression of SPARC was also negatively correlated with Ki-67-LI. Our findings suggest that both the expression of SPARC and VEGF are closed to tumor angiogenesis in gastric cancer, SPARC inhibited tumor angiogenesis but VEGF promoted tumor angiogenesis. SPARC also inhibited cells proliferation of gastric cancer.
authors.affiliation: Department of Pathology, The First Clinical College of Harbin Medical University, Harbin 150001, China. hljwlf@yahoo.cn
authors.forename: Lifeng
authors.initials: L
authors.lastname: Wang
authors.forename: Miling
authors.initials: M
authors.lastname: Yang
authors.forename: Lihui
authors.initials: L
authors.lastname: Shan
authors.forename: Lei
authors.initials: L
authors.lastname: Qi
authors.forename: Cuicui
authors.initials: C
authors.lastname: Chai
authors.forename: Qiufeng
authors.initials: Q
authors.lastname: Zhou
authors.forename: Ke
authors.initials: K
authors.lastname: Yao
authors.forename: Hongmei
authors.initials: H
authors.lastname: Wu
authors.forename: Wenguang
authors.initials: W
authors.lastname: Sun
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D018952:Antigens, CD34 / Q000378:metabolism; D014408:Biomarkers, Tumor / Q000378:metabolism*; D016022:Case-Control Studies; D049109:Cell Proliferation; D005260:Female; D005753:Gastric Mucosa / Q000378:metabolism*; D006801:Humans; D007124:Immunoenzyme Techniques; D019394:Ki-67 Antigen / Q000378:metabolism; D008207:Lymphatic Metastasis; D008297:Male; D008833:Microcirculation; D008875:Middle Aged; D009367:Neoplasm Staging; D009389:Neovascularization, Pathologic; D015676:Osteonectin / Q000378:metabolism*; D011379:Prognosis; D013274:Stomach Neoplasms / Q000098:blood supply* / Q000378:metabolism* / Q000473:pathology; D042461:Vascular Endothelial Growth Factor A / Q000378:metabolism
chemical_list: D018952:Antigens, CD34; D014408:Biomarkers, Tumor; D019394:Ki-67 Antigen; D015676:Osteonectin; C467484:VEGFA protein, human; D042461:Vascular Endothelial Growth Factor A