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Abstract: Background: In the Netherlands the incidence of colorectal cancer has increased, mainly in the eastern part of the country. Patient delay due to unawareness or ignorance of symptoms and differences in use of diagnostic tools could have influence on the stage distribution. The aim of this study was to evaluate geographical differences in stage-specific incidence rates of colon and rectal cancer in the Netherlands. Methods: Age-adjusted incidence rates for cancers of the colon and rectum diagnosed in 2001–2005 and registered in the Netherlands Cancer Registry were calculated for each municipality and stage. The incidence for each 500m by 500m grid was estimated as a weighted average of the incidence rates of the neighbouring municipalities. The incidence rates and the stage distribution are both presented as maps. Geographic variation in stage-specific incidence was evaluated using spatial scan statistic. Results: In both colon and rectal cancer, significant spatial variation in stage-specific incidences was found, except for colon cancer of stages III and IV. The regions with a higher stage-specific incidence were almost all in the south eastern part of the Netherlands, however, these differences were not seen in the stage distribution. There were no differences in stage distribution between large cities and the rest of the country. Conclusions: These maps give insight into differences in stage-specific incidences of colon and rectal cancer in the Netherlands. Educational interventions to increase the awareness of symptoms of colorectal cancer may be especially useful for the population in regions with high incidence of advanced stages. [Copyright &y& Elsevier]

In many industrialized countries, with some degree of screening, cervical cancer nowadays is most frequent among women of lower socioeconomic status (SES), partly owing to their lower participation in screening. This study aims to provide support for specification of mass screening policy for cervical cancer by describing relationships between sociodemographic factors and the incidence of cervical cancer in the Netherlands based on geographical differences and by analysing the relationship between SES of neighbourhood and individual tumour characteristics. Municipality-specific, age-adjusted incidence rates for cervical cancer were calculated from the Netherlands Cancer Registry, and data on sociodemographic factors were obtained from Statistics Netherlands. Logistic regression analysis was performed to investigate determinants of variations in incidence at the ecological level. An additional analysis linked individual tumour characteristics to SES estimates at the postal code level by calculating relative risks (RR). The incidence was higher in municipalities with a high prevalence of immigrants [odds ratios 7.9, 1.4-47 95% confidence intervals (CI)] and with more individuals on welfare (odds ratios 8.6, 1.7-43 95% CI). Patients residing in neighbourhoods with lower SES had higher Federation of Gynecology and Obstetrics stages (RR 1.4, 1.2-1.6 95% CI) and fewer adenocarcinomas (RR 0.7, 0.6-0.9 95% CI), and were younger at diagnosis (P<0.001). Cervical cancer is more common among women of lower SES and immigrant women. This, together with the finding that lower SES is associated with more advanced cancer and consequently worse survival, emphasizes the importance of future cervical cancer prevention programmes targeted at women of lower SES who do not participate in opportunistic screening.

Incidence of cancer may vary within a country and over time because of previous differences in exposure to risk factors or interventions for early detection (screening). This study describes time-space trends of incidence of common cancer sites across the Netherlands during the period 1989-2003 and speculates on the reasons for the observations. From the Netherlands Cancer Registry, World standardized incidence rates per municipality were smoothed calculating weighted averages for each 2 km by 2 km grid of the population mid-points of neighbouring municipalities and presented as map animations. Spatial relative changes in incidence were estimated by comparing the periods 1989-1994 and 1998-2003. Complete time-space trends can be found as map animations on http://maps.ikcnet.nl. The incidence of cervical and stomach cancer (for both sexes) decreased, being higher in the cities than in the rural areas during all periods and contrasting the trends in colorectal and breast cancer. The relative increase in incidence of lung cancer among females was highest in the rural north, but the incidence remained higher in the cities of the mid-west Netherlands. For males, there was a marked decrease in lung cancer incidence across the country since 1991. Incidence of melanoma increased, rates being twice as high in the coastal area than in the cities. Prostate cancer maps largely replicated the known history of PSA-testing in the Netherlands. Time-space cancer incidence patterns gave insight into effects of changes in exposure to risk determinants and early detection. The maps illustrate marked potential for cancer prevention at the national and regional level., ((c) 2008 Wiley-Liss, Inc.)

With respect to cervical cancer management, Finland and the Netherlands are comparable in relevant characteristics, e.g., fertility rate, age-of-mother at first birth and a national screening programme for several years. The aim of this study is to compare trends in incidence of and mortality from cervical cancer in Finland and the Netherlands in relation to the introduction and intensity of the screening programmes. Therefore, incidence and mortality rates were calculated using the Cancer Registries of Finland and the Netherlands. Data on screening intensity were obtained from the Finnish Cancer Registry and the Dutch evaluation centre at ErasmusMC-Rotterdam. Women aged 30-60 have been screened every 5 years, in Finland since 1992 and in the Netherlands since 1996. Screening protocols for smear taking and referral to the gynaecologist are comparable. Incidence and mortality rates have declined more in Finland. In 2003, age-adjusted incidence and mortality in Finland were 4.0 and 0.9 and in the Netherlands 4.9 and 1.4 per 100,000 woman-years, respectively. Excess smear use in the Netherlands was estimated to be 24 per 1,000 women during a 5-year interval compared to 121 in Finland. The decline in mortality in Finland seems to be almost completely related to the screening programme whereas in the Netherlands it was initially considered to be a natural decline. Differences in risk factors might also play a role: the Netherlands has higher population density and higher percentages of immigrants and (female) smokers. The greater excess smear use in Finland might also have affected incidence.

To investigate the laterality of cutaneous melanoma (ICD-10 C43), we obtained data spanning the period of diagnosis 1998-2003 from six population-based cancer registries: New South Wales, Australia; England; Finland; The Netherlands; Scotland; and the Surveillance Epidemiology and End Results (SEER) Program of the United States of America (restricted to 'White' race category only). For cases with laterality recorded, the overall ratios of left- to right-sided tumours were calculated. We found that left to right ratios were consistently greater than 1.00, ranging from 1.08 (New South Wales, Australia and US SEER 'White') to 1.18 (Scotland), with an overall ratio for all registries combined of 1.10 (95% confidence interval 1.08-1.11). There were no statistically significant differences by sex or age group for all sub-sites combined, or for upper limb or lower limb melanomas. The excess of left-sided tumours seems unlikely to be explained by chance or recording bias. The most likely explanations would appear to be either differences in sun exposure and/or asymmetry of melanocyte distribution or characteristics arising at the time of embryological development.

Background: Many women develop breast cancer after treatment for Hodgkin lymphoma (HL) at a young age. We estimated this future risk, taking into account age and calendar year of HL diagnosis, HL treatment information, population breast cancer incidence rates, and competing causes of death., Methods: Relative risks of breast cancer for categories defined by radiation dose to the chest (0, 20- < 40 Gy, or > or = 40 Gy) and use of alkylating agents (yes or no) were estimated from a case-control study conducted within an international population-based cohort of 3817 female 1-year survivors of HL diagnosed at age 30 years or younger from January 1, 1965, through December 31, 1994. To compute cumulative absolute risks of breast cancer, we used modified standardized incidence ratios to relate cohort breast cancer risks to those in the general population, enabling application of population-based breast cancer rates, and we allowed for competing risks by using population-based mortality rates in female HL survivors., Results: Cumulative absolute risks of breast cancer increased with age at end of follow-up, time since HL diagnosis, and radiation dose. For an HL survivor who was treated at age 25 years with a chest radiation dose of at least 40 Gy without alkylating agents, estimated cumulative absolute risks of breast cancer by age 35, 45, and 55 years were 1.4% (95% confidence interval [CI] = 0.9% to 2.1%), 11.1% (95% CI = 7.4% to 16.3%), and 29.0% (95% CI = 20.2% to 40.1%), respectively. Cumulative absolute risks were lower in women treated with alkylating agents., Conclusions: Breast cancer projections varied considerably by type of HL therapy, time since HL diagnosis, and age at end of follow-up. These estimates are applicable to HL survivors treated with regimens of the past and can be used to counsel such patients and plan management and preventive strategies. Projections should be used with caution, however, in patients treated with more recent approaches, including limited-field radiotherapy and/or ovary-sparing chemotherapy.