Tapio Rytömaa

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Degenerated intervertebral disc has lost its normal architecture, and there are changes both in the nuclear and annular parts of the disc. Changes in cell shape, especially in the annulus fibrosus, have been reported. During degeneration the cells become more rounded, chondrocyte-like, whereas in the normal condition annular cells are more spindle shaped.(More)
BACKGROUND Inhaled radon has been shown to cause lung cancer among underground miners exposed to very high radon concentrations, but the results regarding the effects of residential radon have been conflicting. PURPOSE Our aim was to assess the effect of indoor radon exposure on the risk of lung cancer. METHODS To investigate this effect, a nested(More)
Angiogenesis is essential in tissue growth and regeneration. There are several factors that are able to stimulate vascular endothelial cell growth, including platelet-derived growth factor (PDGF) and vascular endothelial growth factor (VEGF). Disc herniation tissue (DHT) contains vascular ingrowth, which promotes granulation tissue formation. In this study(More)
A study with 291 cases and 495 controls on indoor radon and lung cancer incidence was conducted in a Finnish population residing in a high-exposure area. Relative risks of 1.8 and 1.5 for the incidence of lung cancer were observed for those exposed to concentrations of 95-185 Bq m(-3) and 186 Bq m(-3), respectively. The increase in risk was not(More)
Possible effects of Chernobyl fallout on outcome of pregnancy in Finland were evaluated in a nationwide follow-up study. The outcomes were the rate of live births and stillbirths, pregnancy loss, and induced abortions by municipality. Exposure was assessed based on nationwide surveys of radiation dose rate from the Chernobyl fallout, from both external and(More)
STUDY DESIGN Basic fibroblast growth factor immunoreactivity was studied in disc herniation tissue. OBJECTIVES The first objective was to analyze in which tissue components, if any, fibroblast growth factor is expressed in the disc herniation. The second objective was to compare such expression with that in fresh cadaver disc tissue. SUMMARY OF(More)
AIMS/BACKGROUND The aim of this study was to identify p53 and K-ras gene mutations in carcinoma of the rectum among Finnish women. Mutation patterns might give clues to aetiological factors when comparisons are made with other human tumours. METHODS Of 134 women with carcinoma of the rectum, paraffin wax embedded specimens of the tumour tissue were(More)
A cohort of 4,742 men from Estonia who had participated in the cleanup activities in the Chernobyl area sometime between 1986 and 1991 and were followed through 1993 was analyzed with respect to the incidence of cancer and mortality. Incidence and mortality in the cleanup workers were assessed relative to national rates. No increases were found in all(More)
OBJECTIVE To assess effects of fallout from Chernobyl on incidence of childhood leukaemia in Finland. DESIGN Nationwide cohort study. External exposure measured for 455 Finnish municipalities with instruments driven 19,000 km throughout the country. Values specific to municipalities corrected for shielding due to houses and fallout from A bomb testing.(More)
A single accidental event such as the fallout released from the Chernobyl reactor in 1986 can expose millions of people to non-natural environmental radiation. Ionizing radiation increases the frequency of germline mutations in experimental studies, but the genetic effects of radiation in humans remain largely undefined. To evaluate the hereditary effects(More)