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Sökning: WFRF:(Palmqvist Richard) > (2005-2009)

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  • Föregående 1[2]34Nästa
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  • Försti, A, et al. (författare)
  • Polymorphisms in the genes of the urokinase plasminogen activation system in relation to colorectal cancer
  • 2007
  • Ingår i: Annals of Oncology. - : Oxford University Press. - 0923-7534 .- 1569-8041. ; 18:12, s. 1990-1994
  • Tidskriftsartikel (refereegranskat)abstract
    • Background: Extracellular matrix degradation, mediated by the urokinase plasminogen activation (uPA) system, is a critical step in tumor invasion and metastasis. High tumor levels of uPA and its inhibitor PAI-1 have been correlated with poor cancer prognosis. We examined four single nucleotide polymorphisms (SNPs) with a potential effect on expression of genes in the uPA system for their role in colorectal cancer susceptibility and prognosis.Patients and methods: We genotyped the SNPs in 308 Swedish incident colorectal cancer patients with up to 16 years of follow-up and in 585 age- and sex-matched controls. We evaluated the associations between genotypes and colorectal cancer and Dukes' stage. Survival probabilities were compared between different subgroups.Results: Patients with PAI-1 –675 5G/5G genotype had better survival than patients with 4G/4G or 4G/5G genotypes when they had Dukes' stage A or B tumors (P = 0.023 and P = 0.015, respectively). No statistically significant association was observed between the SNPs and the risk of colorectal cancer or Dukes' stage.Conclusions: Our results suggest a role for the PAI-1 genotype in colorectal cancer prognosis, but further studies are needed to evaluate the impact of our finding in the clinic.
  • Gao, Jingfang, 1966- (författare)
  • Molecular and Biological Characteristics of Stroma and Tumor Cells in Colorectal Cancer
  • 2008
  • Doktorsavhandling (övrigt vetenskapligt)abstract
    • Carcinogenesis is a progressive process involving multiple genetic alterations in tumor cells and complex interactions in the tumor-host microenvironment. To better understand the contribution of molecular alterations in tumor cells and stromal variables to the development of colorectal cancer (CRC) and identify prognostic factors, in this study we examined the clinicopathological and biological significance of stromal variables, including particularly interesting new cysteine-histidine rich protein (PINCH), inflammatory infiltration, angiogenesis and lymphangiogenesis, as well as hRAD50/hMRE11/hNBS1 proteins and hRAD50 mutation in tumor cell in CRC.PINCH protein expression in the stroma was increased from normal mucosa to primary tumors and further to lymph node metastases. In particular, PINCH expression was most intense at the tumor invasive margin, which was related to low inflammatory infiltration and independently related to an unfavorable prognosis. Low inflammatory infiltration at the tumor invasive margin was related to advanced tumor stage, worse differentiation and microsatellite instability (MSI). Further, it was independently related to an unfavorable prognosis. Increased blood and lymphatic vessel density was observed in the primary tumors compared with the corresponding normal mucosa. However, neither angiogenesis nor lymphangiogenesis was associated with tumor stage and patients’ survival. Moreover, PINCH was present in a proportion of endothelial cells of the tumor vasculature, and PINCH expression in tumor-associated stroma was positively related to blood vessel density.In primary tumor cells of CRC, strong expression of hRAD50, hMRE11 or hNBS1 was related to microsatellite stability (MSS). A high percentage of hMRE11 expression was associated with less local recurrence and high apoptotic activity. Further, we observed that the expression of hRAD50, hMRE11 or hNBS1 among normal mucosa, primary tumors and metastases in MSS CRC differed from that in MSI CRC. In MSS CRC, the expression intensity of hRAD50, hMRE11 and hNBS1 was consistently increased with respect to normal mucosa, but there was no difference between the primary tumors and metastases. In the primary MSS tumors, the expression of individual or combination of hRAD50/hMRE11/hNBS1 was associated with a favorable prognosis in the same series of the CRCs. Moreover, strong/high hRAD50 in MSS primary tumors was related to earlier tumor stage, better differentiation and high inflammatory infiltration, whereas strong hNBS1 expression tended to be independently related to a favorable prognosis in MSS CRC with earlier tumor stage. However, in MSI CRC, there were neither differences in the expression of hRAD50/hMRE11/hNBS1 among normal mucosa, primary tumors and metastases, nor any association of the protein expressions with clinicopathological variables. On the other hand, frameshift mutations of (A)9 at coding region of hRAD50 were only found in MSI CRC.Our study indicates that 1) PINCH is likely a regulator of angiogenesis, and PINCH expression at the tumor invasive margin is an independent prognostic indicator in CRC. 2) Inflammatory infiltration at the tumor invasive margin is also an independent prognostic indicator in CRC. The lack of association between high inflammatory infiltration and MSI may help to explain the non-association of MSI with survival in CRC patients. 3) Angiogenesis and lymphangiogenesis occur in the early stage of CRC development, but do not associate with CRC progression and patients’ prognosis. 4) hRAD50/hMRE11/hNBS1 may act dependently and independently, playing different roles in MSS and MSI CRC development. In MSS CRC, the strong expression of the three proteins, associated with a favorable prognosis, may present the cellular response against tumor progression. Expression of hNBS1 may be a prognostic indicator for MSS CRC patients in the earlier tumor stage. In MSI CRC, the frameshift mutations at the coding region of hRAD50 may contribute to tumor development.
  • Hahn-Strömberg, Victoria, 1971- (författare)
  • Cell adhesion proteins in different invasive patterns of colon carcinomas : a morphometric and molecular genetic study
  • 2008
  • Doktorsavhandling (övrigt vetenskapligt)abstract
    • Colorectal carcinoma is the second most common type of cancer in both men and women in Sweden. Cancer of the colon and rectum are often considered together and their ten year survival rate is approximately 50 – 60 % depending on sex and location. Different histopathological characteristics of such cancers, including the complexity of growth, are of importance for prognosis. This thesis has compared different morphometric methods in order to achieve a quantitative and objective measurement of the invasive front of colon carcinoma. Since the growth pattern is dependent on the cell adhesiveness of different proteins we studied the distribution and localization of E-cadherin, Beta-catenin, Claudin 1,2,7 and Occludin as well as screened the genes for mutations. We found a perturbed protein expression of E-cadherin, Beta-catenin, Claudin 1,2,7 and Occludin in tumor sections compared to normal mucosa, but no relation to tumor volume or growth pattern could be seen. The tumor volume was found to be correlated to the growth pattern but not responsible to the perturbed protein expression. In the mutation screening we found a SNP in exon 13 the E-cadherin gene in the tumor, as well as in exon 2 of Claudin 1 and exon 4 of Claudin 7 in both tumor and normal mucosa. No correlation between mutations and growth pattern or tumor volume was found. In conclusion, this thesis shows that the computer image analysis with estimation of fractal dimension and number of free tumor cell clusters is superior to the semi quantitative visual grading of tumor invasive complexity. The aberrant expression of cell adhesion proteins in the tumor compared to normal mucosa as well as polymorphisms in the cell adhesion genes CLDN1 and CLDN7 in both tumor and normal mucosa can suggest that these aberrations are important in the tumorigenesis of colon carcinoma.  
  • Hart, Andrew R, et al. (författare)
  • Diet in the aetiology of ulcerative colitis: A European prospective cohort study
  • 2008
  • Ingår i: Digestion. - : Karger. - 1421-9867. ; 77:1, s. 57-64
  • Tidskriftsartikel (refereegranskat)abstract
    • Background/Aims: The causes of ulcerative colitis are unknown, although it is plausible that dietary factors are involved. Case-control studies of diet and ulcerative colitis are subject to recall biases. The aim of this study was to examine the prospective relationship between the intake of nutrients and the development of ulcerative colitis in a cohort study. Methods: The study population was 260,686 men and women aged 20-80 years, participating in a large European prospective cohort study (EPIC). Participants were residents in the UK, Sweden, Denmark, Germany or Italy. Information on diet was supplied and the subjects were followed up for the development of ulcerative colitis. Each incident case was matched with four controls and dietary variables were divided into quartiles. Results: A total of 139 subjects with incident ulcerative colitis were identified. No dietary associations were detected, apart from a marginally significant positive association with an increasing percentage intake of energy from total polyunsaturated fatty acids (trend across quartiles OR = 1.19 (95% CI = 0.99-1.43) p = 0.07). Conclusions: No associations between ulcerative colitis and diet were detected, apart from a possible increased risk with a higher total polyunsaturated fatty acid intake. A biological mechanism exists in that polyunsaturated fatty acids are metabolised to pro-inflammatory mediators.
  • Isaksson-Mettävainio, Martin, et al. (författare)
  • c-Met expression in primary tumors and their corresponding distant metastases
  • 2009
  • Ingår i: Molecular Medicine Reports. - Umeå. - 1791-2997. ; 1:6, s. 787-790
  • Tidskriftsartikel (refereegranskat)abstract
    • c-Met is a receptor tyrosine kinase that has beenimplicated in the pathogenesis and growth of a wide variety ofhuman malignancies, including CRC, but its role in metastasisis largely unknown. We compared c-Met expression in primaryhuman colorectal carcinomas and distant metastases from thesame patients. Formalin-fixed paraffin-embedded tissuesamples from 69 colorectal cancer patients were obtained. Theprotein expression of c-Met was evaluated immunohistochemicallyusing a commercial antibody. The difference inexpression between primary tumors and their correspondingdistant metastases was analyzed using the Wilcoxon signedranktest. c-Met expression was statistically significantlylower in the distant metastases compared to their correspondingprimary tumors (p<0.001), whereas no difference was foundbetween lymph node metastases and their correspondingprimary tumors (p=0.957). The degree of c-Met expressionwas not related to clinicopathological characteristics such astumor grade and Dukes' stage at the time of primary tumordiagnosis, or to the location of the distant metastases. Wedemonstrated that c-Met expression is often reduced in distantmetastases compared to their corresponding primary colorectaltumors. Additional studies of c-Met activation and signaltransduction will increase our knowledge about the role ofc-Met in colorectal cancer metastasis.
  • Jenab, Mazda, et al. (författare)
  • Consumption and portion sizes of tree nuts, peanuts and seeds in the European Prospective Investigation into Cancer and Nutrition (EPIC) cohorts from 10 European countries
  • 2006
  • Ingår i: British Journal of Nutrition. - Cambridge : Cambridge University Press. - 1475-2662 .- 0007-1145. ; 96:1, s. 12-23
  • Tidskriftsartikel (refereegranskat)abstract
    • Tree nuts, peanuts and seeds are nutrient dense foods whose intake has been shown to be associated with reduced risk of some chronic diseases. They are regularly consumed in European diets either as whole, in spreads or from hidden sources (e.g. commercial products). However, little is known about their intake profiles or differences in consumption between European countries or geographic regions. The objective of this study was to analyse the population mean intake and average portion sizes in subjects reporting intake of nuts and seeds consumed as whole, derived from hidden sources or from spreads. Data was obtained from standardised 24-hour dietary recalls collected from 36 994 subjects in 10 different countries that are part of the European Prospective Investigation into Cancer and Nutrition (EPIC). Overall, for nuts and seeds consumed as whole, the percentage of subjects reporting intake on the day of the recall was: tree nuts=4 center dot 4%, peanuts=2 center dot 3 % and seeds=1 center dot 3 %. The data show a clear northern (Sweden: mean intake=0 center dot 15 g/d, average portion size=15 center dot 1 g/d) to southern (Spain: mean intake=2 center dot 99 g/d, average portion size=34 center dot 7 g/d) European gradient of whole tree nut intake. The three most popular tree nuts were walnuts, almonds and hazelnuts, respectively. In general, tree nuts were more widely consumed than peanuts or seeds. In subjects reporting intake, men consumed a significantly higher average portion size of tree nuts (28 center dot 5 v. 23 center dot 1 g/d, P < 0 center dot 01) and peanuts (46 center dot 1 v. 35 center dot 1 g/d, P < 0 center dot 01) per day than women. These data may be useful in devising research initiatives and health policy strategies based on the intake of this food group.
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  • Föregående 1[2]34Nästa
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