Guo-Yang Wu

Binzhou Medical University, Pei-chen, Shandong Sheng, China

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Publications (10)14.29 Total impact

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    ABSTRACT: Phospho-PRAS40(Thr246) (phosphorylated proline-rich Akt substrate of 40 kilodaltons at Thr246) is a biomarker for phosphatidylinositol 3-kinase (PI3K) pathway activation and AKT inhibitors sensitivity. In this study, we immunohistochemically investigated the expression of phospho-PRAS40(Thr246) in 141 gastric cancer tumors, and evaluated its clinicopathological and prognostic significance. Sixty-four cases (45.4%) were defined as phospho-PRAS40(Thr246) positive. Phospho-PRAS40(Thr246) correlated positively with lymph node metastasis, lymphatic infiltration, vascular infiltration and shorter survival. Furthermore, phospho-PRAS40(Thr246) is an independent prognostic factor for gastric cancer. Our data suggest that phospho-PRAS40(Thr246) was frequently expressed in gastric cancers, and correlated with malignant progression and poor prognosis of patients. PI3K pathway-targeted therapies should be considered in the future treatment of gastric cancers.
    Archives of Medical Science 02/2014; 10(1):149-53. · 1.89 Impact Factor
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    ABSTRACT: The study investigated the extraction process of active ingredients from akebia stem and an analysis of their anti-gastric cancer activity. Three different extraction methods were used to obtain extracts, namely the decoction method (group A), reflux extraction method (group B), and maceration method (group C), of which reflux extraction method and maceration method used ethanol as the extraction solvent, while decoction method used distilled water for extraction. The differences in anti-gastric cancer activity of the three extracts were compared. MTT assay was used to test and compare the inhibitory effects of extracts obtained in A, B, and C groups on gastric cancer cells. The results showed that the dry extract obtained by heat reflux extraction with "water-ethanol" ratio of 1:2, extractant volume of 70 ml, with ethanol as extraction solvent presented the best inhibitory activity on gastric cancer SGC-7901 cells in this study. Its inhibitory effect did not change over time, and was directly proportional to the concentration.
    African Journal of Traditional, Complementary and Alternative Medicines 01/2013; 10(5):313-7. · 0.56 Impact Factor
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    ABSTRACT: Introduction: Up to present, EGF 61*A/G, TGF-β1 -509*T/C and TNF-α -308*A/G gene polymorphisms have been analysed in other cancer entities than hepatocellular carcinoma (HCC). We here investigated the frequency of these gene polymorphisms among HCC patients. Materials and Methods: A total of 73 HCC patients and 117 cancer-free healthy people were recruited at the Surgical Department of Zhongshan Hospital. Genomic DNA was isolated from peripheral blood and gene polymorphisms were analyzed by PCR-RFLP. Results: The distribution of EGF 61*G/G homozygotes among HCC patients was more frequent than that in the control group (24.7% vs 11.1%, OR=2.618, 95%CI=1.195-5.738). In parallel, the frequency of the "G" allele in the HCC patient group was also higher than that in the control group (45.9% vs 33.3%, OR= 1.696, 95%CI=1.110-2.592). No difference could be found for the TGF-β1-509 and TNF-α -308 genotypes. Conclusion: EGF 61*G/G genotype and G allele are significantly increased among patients with HCC. TGF-β1-509*T/C and TNF-α -308*A/G gene polymorphisms are not related to this cancer entity.
    Asian Pacific journal of cancer prevention: APJCP 12/2012; 13(12):6217-20. · 1.50 Impact Factor
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    Yu Xiong, Qing-Jun Lu, Jing Zhao, Guo-Yang Wu
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    ABSTRACT: Recently, population-based studies of type 2 diabetes patients have provided evidence that metformin treatment is associated with a reduced cancer incidence and mortality, but its mode of action remains unclear. Here we report effects of metformin on hepatocellular carcinoma (HCC) Hep-G2 cells and details of molecular mechanisms of metformin activity. Our research indicates that metformin displays anticancer activity against HCC through inhibition of the mTOR translational pathway in an AMPK-independent manner, leading to G1 arrest in the cell-cycle and subsequent cell apoptosis through the mitochondrion-dependent pathway. Furthermore, we showed that metformin strongly attenuated colony formation and dramatically inhibited Hep-G2 tumor growth in vivo. In conclusion, our studies suggested that metformin might have potential as a cytotoxic drug in the prevention and treatment of HCC.
    Asian Pacific journal of cancer prevention: APJCP 07/2012; 13(7):3275-9. · 1.50 Impact Factor
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    ABSTRACT: P21-activated protein kinase (Pak1), a main downstream effector of small Rho GTPases, plays an important role in the regulation of cell morphogenesis, motility, mitosis and angiogenesis. However, the role of Pak1 in gastric cancer metastasis remains unclear. Here, we showed that Pak1 is overexpressed in gastric cancer tissues from 74 patients by immunohistochemistry. Overexpression of Pak1 was associated with metastasis and prognosis of gastric cancer. In addition, overexpression of Pak1 increased gastric cancer cell motility and invasion, whereas downregulation of Pak1 expression reduced gastric cancer cell migration and invasion. In further study, data showed that activated Pak1 inhibited stress fiber and focal adhesion complex formation in gastric cancer cells and led to the formation of motile phenotypes. Importantly, activated Pak1 elicited phosphorylation of the ERK and JNK-dependent pathway in gastric cancer cell lines. In conclusion, our results suggest that Pak1 is overexpressed in gastric cancer and plays an important role in the metastasis of gastric cancer. The mechanism by which Pak1 induces cancer metastasis may involve activation of ERK and JNK.
    Oncology Reports 05/2012; 27(5):1435-42. · 2.19 Impact Factor
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    ABSTRACT: To date, EGF 61*A/G, TGF-β1 -509*T/C and TNF-α -308*A/G gene polymorphisms have been not been analysed in pancreatic carcinoma. This study investigated the frequency of these gene polymorphisms among patients with cancer of the pancreatic head. A total of 73 pancreatic head cancer patients and 117 cancer-free healthy people were recruited at the Surgical Department of the University Hospital Mannheim. Genomic DNA was isolated from peripheral blood and gene polymorphisms were analysed by PCR-RFLP. The distribution of EGF 61*G/G homozygotes among pancreatic head cancer patients was more frequent than that in the control group (24.7% vs 11.1%, odds ratio (OR) = 2.618, 95% confidence interval (CI) = 1.195-5.738). In addition, the frequency of the G allele in the pancreatic head cancer patient group was also higher than that in the control group (45.9% vs. 33.3%, OR = 1.696, 95% CI = 1.110-2.592). No difference was found for the TGF-β1 -509 and TNF-α -308 genotypes among pancreatic head cancer patients and healthy controls. The frequencies of the EGF 61*G/G genotype and G allele are significantly increased among patients with pancreatic head cancer. TGF-β1-509*T/C and TNF-α -308*A/G gene polymorphisms are not related to this cancer entity.
    Anticancer research 12/2010; 30(12):5257-61. · 1.87 Impact Factor
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    ABSTRACT: To elucidate the association of TNF-alpha-308G/A gene functional polymorphism with the development and progression of colorectal cancer. PCR-RFLP was employed to detect the TNF-alpha-308 G/A genotypes in 157 colorectal cancer patients and 117 healthy controls. The frequency of TNF-alpha-308 genotype and allele were not significantly different between colorectal cancer patients and healthy controls (genotype chi(2)=1.054, P=0.591, allele chi(2)=0.404, P=0.525). The frequency of A/A genotype and A allele in III+IV stage (62 patients in total) were higher than those in I+II stages (85 patients in total) (A allele: 22.6% vs 12.9%, A/A genotype: 8.1% vs 1.2%), and the differences were significant (genotype P=0.048, OR=7.368, 95% CI=0.839-64.743, allele chi(2)=4.720, P=0.03, OR=1.962, 95% CI=1.061-3.628). The frequency of TNF-alpha-308 genotype were not significantly different among different colorectal cancer grades (chi(2)=3.009,P=0.591). TNF-alpha-308G/A gene polymorphism is not associated with the development of colorectal cancer, but TNF-alpha-308 A/A genotype and A allele are related to the progression of colorectal cancer.
    Zhonghua wei chang wai ke za zhi = Chinese journal of gastrointestinal surgery 12/2008; 11(6):569-71.
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    ABSTRACT: Up to the present, EGF 61 A/G, TGF-beta1 -509 T/C, and VEGF 936 T/C gene polymorphisms have been analyzed in other cancer entities than colorectal cancer. We have now investigated the frequency of these gene polymorphisms among colorectal cancer patients. A total of 157 colorectal cancer patients and 117 cancer-free healthy people were recruited at the Surgical Department of the Universitätsklinikum Mannheim. All patients and healthy people are Caucasians. Genomic DNA was isolated from peripheral blood, and gene polymorphisms were analyzed by polymerase chain reaction-restriction fragment length polymorphism (PCR-RFLP). The distribution of EGF 61 G/G homozygotes among colorectal cancer patients was more frequent than that in the control group (33.1% versus 11.1%; Odds Ratio [OR]=3.962; 95% Confidence Interval [CI]=2.036-7.708). The frequency of the "G" allele in the colorectal cancer patient group was also higher than that in the control group (51.3% versus 33.3%; OR=2.105; 95% CI=1.482-2.988). No difference could be found for the TGF-beta1 and VEGF genotypes among colorectal cancer patients and healthy controls. The EGF 61 G/G genotype and the G allele are significantly related to colorectal cancer. The TGF-beta1 -509 T/C and VEGF 936 T/C gene polymorphisms are not related to colorectal cancer.
    World Journal of Surgery 12/2008; 33(1):124-9. · 2.35 Impact Factor
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    ABSTRACT: To evaluate the preventive effects of phosphorus-32 glass microspheres (P32-GMS) in the recurrence of massive hepatocellular carcinomas (HCCs) after tumor resection. Twenty-nine patients with massive HCCs received local P32-GMS implantation after liver tumors were removed, while the other 38 patients with massive HCCs were not treated with P32-GMS after hepatectomies. The radioactivity of the blood, urine and liver were examined. The complications, HCC recurrence and overall survival rates in the patients were analyzed. P32-GMS implanted in the liver did not cause systemic absorption of P32. There were no significant differences of postoperative complications between the patients with and without P32-GMS treatment. The short-term (six months and 1 year) and long-term (2, 3 and over 3 years) recurrence rates in patients who received P32-GMS radiotherapy were significantly decreased, and the overall survival rates in this group were significantly improved. P32-GMS implantation in the liver can significantly decrease the postoperative recurrence and improve the overall survival in HCCs patients after hepatectomy. This therapy may provide an innovative method in prevention of HCC recurrence after operation.
    World Journal of Gastroenterology 02/2008; 14(4):518-23. · 2.43 Impact Factor
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    ABSTRACT: To investigate the association between VEGF gene 936 T/C polymorphism and colorectal cancer together with anastomotic leakage. Polymerase chain reaction-restriction fragment length polymorphism (PCR-RFLP) was used to detect the VEGF 936 T/C genotypes in colorectal cancer patients and healthy controls. There was no significant difference in the frequency of VEGF 936 C/C genotype or C allele between colorectal cancer patients and healthy controls (P > 0.05). The C/C genotype or C allele in colorectal cancer patients with anastomotic leakage was less frequently found than in the group without anastomotic leakage (P < 0.05). VEGF 936 C/C genotype or C allele is not related to the development of colorectal cancer, but they can reduce the risk of anastomotic leakage after surgery in colorectal cancer patients.
    Zhonghua wai ke za zhi [Chinese journal of surgery] 11/2006; 44(21):1505-7.