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Sökning: WFRF:(Tamminen A.) > (2005-2009)

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  • Aaltonen, Kirsimari, et al. (författare)
  • High cyclin B1 expression is associated with poor survival in breast cancer
  • 2009
  • Ingår i: British Journal of Cancer. - 0007-0920 .- 1532-1827. ; 100:7, s. 1055-60
  • Tidskriftsartikel (refereegranskat)abstract
    • Cyclin B1 regulates the G(2)-M transition of the cell cycle. Cyclin B1 expression is higher in premalignant and malignant than normal breast lesions. Correlation of cyclin B1 expression with other histopathological variables and prognostic role in breast cancer are not fully understood. Traditionally used prognostic criteria identify large subset of patients to receive adjuvant chemotherapy and to be exposed to adverse effects. A reliable and simple method helping prognostic evaluation in breast cancer is needed. We analysed cyclin B1 expression on 1348 invasive breast cancers and studied correlations with other histopathological variables and survival. High cyclin B1 correlated with high tumour grade, large tumour size and positive nodal status, oestrogen and progesterone receptor negativity, positive HER2 and p53 status, young age at diagnosis, and high cyclin E, cyclin A and Ki67 expression. Among patients not given adjuvant chemotherapy high cyclin B1 was a strong predictor of shorter overall and metastasis-free survival (RR 3.74, P<0.0005 and RR 3.51, P<0.0005, respectively), and remained as an independent prognostic factor also in multivariate analysis (RR 1.80, P=0.04 and RR 2.31, P=0.02, respectively). This study suggests high cyclin B1 associates with aggressive phenotype and is an independent prognostic factor in breast cancer.
  • Barreiro, A, et al. (författare)
  • Relative importance of the different negative effects of the toxic haptophyte Prymnesium parvum on Rhodomonas salina and Brachionus plicatilis
  • 2005
  • Ingår i: Aquatic Microbial Ecology. - 0948-3055. ; 38:3, s. 259-267
  • Tidskriftsartikel (refereegranskat)abstract
    • The aim of this study was to determine the relative importance of the different processes/mechanisms by which the toxic haptophyte Prymnesium parvum, cultured under different nutrient conditions, affects non-toxic phytoplankton competitors and microzooplankton grazers. P. parvum was cultured under steady-state growth in different nutrient conditions: nitrogen depleted (-N), phosphorus depleted (-P) and balanced nitrogen and phosphorus (+NP). Cells from each nutrient condition and culture cell-free filtrates, alone and combined with non-toxic prey (Rhodomonas salina), were used as food for the rotifer Brachionus plicatilis. An additional experiment was carried out to test the effect of P. parvum cells and culture cell-free filtrate on R. salina. The highest haemolytic activity values were achieved by -P F parvum cultures, followed by -N. However, the negative effect of R parvum on R. salina and rotifers did not correlate with haemolytic activity but with the number of P. parvum cells. -N-cultured P. parvum were the most toxic for both R. salina and rotifers, followed by +NP. Therefore, haemolytic activity is not a good indicator of the total potential toxicity of R parvum. The growth rate of R. salina was negatively affected by cell-free filtrates but the effect of P, parvum predation was greater. Rotifers fed on both toxic and non-toxic algae, indicating that they did not select against the toxic alga. The P. parvum cell-free filtrate had an effect on B. plicatilis, although this was weak, B, plicatilis was also indirectly affected by P. parvum due to the negative effects of the toxic alga on their prey (R. salina). However, the greatest negative effect of P. parvum on the rotifers was due to ingestion of the toxic cells. Therefore, the phytoplankton competitor R. salina is more affected by P. parvum predation and the grazer B. plicatilis is more affected by ingestion of the toxic cells, the effects of excreted compounds being secondary.
  • Oulasvirta, A., et al. (författare)
  • Comparing two approaches to context : Realism and constructivism
  • 2005
  • Ingår i: Critical Computing - Between Sense and Sensibility : Proceedings of the 4th Decennial Aarhus Conference. - 1595932038 - 9781595932037 ; s. 195-198
  • Konferensbidrag (refereegranskat)abstract
    • During the last few years, there have been debates over what is context and how computers should act upon it. Two disparate camps of thought can be recognized. First, Realism, having its roots in natural sciences, believes that contexts exist out there and that, if properly instrumented and programmed, computers can correctly recognize and adapt to them. Second, Constructivism, having its roots in human and social sciences, believes that contexts are human creations, mental and social, and that computers ought to provide resources for managing them. We reveal some fundamental differences between the two in three different application domains. We show that despite the deep-going controversies, both camps benefit from considering the alternative approach and a middle ground can be found.
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