The development of cancer programs and organizations in Canada is traced from their beginnings until the present time, and tribute is paid to our pioneers, of whom Dr. Richards was an outstanding example in this field. Although provinical cancer control measures vary, there is a marked similarity among some, so that they can be categorized into two or three patterns. The desirable requirements for the establishment and progressive development of cancer centres is described together with their relationship to increasing integration of teaching and research activities. An attempt is made to predict the future pattern of our "cancer clinic" system in which there will be increasing reliance on an interdisciplinary approach.
In the last several years, West Nile virus (WNV) was proven to be present especially in the neighboring countries of Austria, such as Italy, Hungary, and the Czech Republic, as well as in eastern parts of Austria, where it was detected in migratory and domestic birds. In summer 2010, infections with WNV were reported from Romania and northern Greece with about 150 diseased and increasingly fatal cases. We tested the sera of 1,607 blood donors from North Tyrol (Austria) and South Tyrol (Italy) for antibodies against WNV by using IgG enzyme-linked immunosorbent assay (ELISA). Initial results of the ELISA tests showed seroprevalence rates of 46.2% in North Tyrol and 0.5% in South Tyrol, which turned out to be false-positive cross-reactions with antibodies against tick-borne encephalitis virus (TBEV) by adjacent neutralization assays. These results indicate that seropositivity against WNV requires confirmation by neutralization assays, as cross-reactivity with TBEV is frequent and because, currently, WNV is not endemic in the study area.
The aim of this study was to reveal whether today's children and adolescents have lower aerobic capacity compared with earlier studies. Aerobic capacity may be defined as the highest amount of oxygen a subject is able to consume per unit of time. Peak oxygen uptake (VO2peak) is often used as a measure of aerobic capacity in children. VO2peak in 196 healthy children and adolescents of both sexes, aged 8-16 years, was measured on a graded treadmill test. The mean results of VO2peak (l.min-1) showed only small differences compared with previous studies in Scandinavia. There was, however, greater dispersion in the present study when the VO2peak-values were corrected for weight (ml.kg-1.min-1) than in the earlier studies. When compared to other countries in Europe, Norwegian subjects achieved higher values. The reason may be due to either genetic differences or to a higher level of physical activity among the Norwegian subjects.
Nasopharyngeal carcinoma is a disease with a remarkable racial and geographical distribution. In most parts of the world it is a rare condition and in only a handful of places does this low risk profile alter. These include the Southern Chinese, Eskimos and other Arctic natives, inhabitants of South-East Asia and also the populations of North Africa and Kuwait.
Multiple sclerosis (MS) most commonly affects individuals of Northern European descent who live in countries at high latitude. The relative contributions of ancestry, country of birth and residence as determinants of MS risk have been studied in adult MS, but have not been explored in the pediatric MS population. In this study, we compare the demographics of pediatric- and adult-onset MS patients cared for in Toronto, Ontario, Canada, a multicultural region. The country of birth, residence during childhood, and ancestry were compared for 44 children and 573 adults. Our results demonstrate that although both the pediatric and adult cohorts were essentially born and raised in the same region of Ontario, Canada, children with MS were more likely to report Caribbean, Asian or Middle Eastern ancestry, and were less likely to have European heritage compared with individuals with adult-onset MS. The difference in ancestry between the pediatric and adult MS cohorts can be explained by two hypotheses: (1) individuals raised in a region of high MS prevalence, but whose ancestors originate from regions in which MS is rare, have an earlier age of MS onset, and (2) the place of residence during childhood, irrespective of ancestry, determines lifetime MS risk -- a fact that will be reflected in a change in the demographics of the adult MS cohort in our region as Canadian-raised children of recent immigrants reach the typical age of adult-onset MS.
A recent method of age-standardisation of relative survival ratios for cancer patients does not require calculation of age-specific relative survival ratios, as ratios of age-specific proportions between the standard population and study group at the beginning of the follow-up are used to substitute the original individual observations. This method, however, leads to direct age-standardisation with weights that are different for each patient group if the general population mortality patterns for the groups are different. This is the case in international comparisons, and in comparisons between genders and time periods. The magnitude of the bias caused by the differences in general population mortality is investigated for comparisons involving European countries and the USA. Patients in each country are assumed to have exactly the same age-specific relative survival ratios as those diagnosed in Finland in 1985-2004. An application of a properly functioning age-standardisation method should then give exactly equal age-standardised relative survival ratios for each country. However, the recent method shows substantial differences between countries, with highest relative survival for populations, where the general population mortality in the oldest ages is the highest. This source of error can thus be a serious limitation for the use of the method, and other methods that are available should then be employed.