Extrapolation of pre-screening trends: Impact of assumptions on overdiagnosis estimates by mammographic screening

Background: Overdiagnosis by mammographic screening is defined as the excess in breast cancer incidence in the presence of screening compared to the incidence in the absence of screening. The latter is often estimated by extrapolating the pre-screening incidence trend. The aim of this theoretical study is to investigate the impact of assumptions in extrapolating the pre-screening incidence trend of invasive breast cancer on the estimated percentage of overdiagnosis. Methods: We extracted data on invasive breast cancer incidence and person-years by calendar year (1975-2009) and 5-year age groups (0-85 years) from Dutch databases. Different combinations of assumptions for extrapolating the pre-screening period were investigated, such as variations in the type of regre

Diagnostics in patients suspect for breast cancer in The Netherlands

The goal of this study was to describe the variation in hospital-based diagnostic care activities for patients with symptomatology suspect for breast cancer in The Netherlands. Two cohorts were included: the 'benign' cohort (30,334 women suspected of, but without breast cancer) and the 'malignant' cohort (2236 breast cancer patients). Hospital-based financial data was combined with tumor data (malignant cohort) from The Netherlands Cancer Registry. Patterns within diagnostic pathways were analyzed. Factors influencing the number of visits and number of diagnostic care activities until diagnosis were identified in the malignant cohort with multivariable Cox and Poisson regression models. Compared to patients with benign diagnosis, patients with malignant disease received their diagnosis less frequently in one day, after an equal average number of hospital visits and higher average number of diagnostic activities. Factors increasing the number of diagnostic care activities were the following: lower age and higher cM-and cN-stages. Factors increasing the number of days until (malignant) diagnosis were as follows: higher BIRADS-score, screen-detected and higher cN-and cT-stages. Hospital of diagnosis influenced both number of activities and days to diagnosis. The diagnostic care pathway of patients with malignant disease required more time and diagnostic activities than benign disease and depends on hospital, tumor and patient characteristics.Imaging- and therapeutic targets in neoplastic and musculoskeletal inflammatory diseas

Breast density and breast cancer-specific survival by detection mode

Contains fulltext : 190922.pdf (publisher's version ) (Open Access

Balletdanseressen in opleiding. Lichamelijke inspanning, lichaamssamenstelling en lengte van de menstruele cyclus

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Prostaatkankerscreening: zinvol of zinloos?

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Balletdanseressen in opleiding. Lichamelijke inspanning, lichaamssamenstelling en lengte van de menstruele cyclus

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Opportunity for breast cancer screening in limited resource countries: a literature review and implications for Iran

Contains fulltext : 174910.pdf (publisher's version ) (Open Access)Young age at occurrence and advanced tumour stage at diagnosis should urge health policy makers to focus on strategies that will help to reduce breast cancer burden in Iran. However, fundamental knowledge to select the optimal control strategy is limited. In this review paper we summarize considerations for launching a successful mass screening program in Iran using a thorough search of the literature focusing on screening activities for breast cancer in limited resource countries (LRCs). The Pubmed and Web of Knowledge databases were used for literature searches with the terms "breast neoplasm' and "screening' in combination with "limited resource countries', or "developing countries'. In addition, the bibliographies of selected references were also searched and utilized. More than 200 articles were found from 2005 to June 2011, of which 96 met the inclusion criteria. Papers were reviewed and categorized as follows: necessity and adoption of screening guidelines in LRCs (n=44); pilot implementation and barriers to screening program in LRCs (n=25); knowledge and attitudes on breast cancer and screening behaviour in LRCs (n=27). The results of the reviewed studies show that the rising trend of breast cancer incidence in LRCs has made it a health priority. Financial constraints to implement mammography screening in LRCs promote the use of alternative but less accurate screening modalities such as physical breast examination. Starting a breast cancer screening program in LRCs faces several challenges related to country's resources status, health service capacity and community awareness. Conservative attitudes toward women, fatalism and misconception on breast cancer risk factors and screening behaviour could seriously prohibit women's participation. In conclusion, given the lack of quantitative information and implementation research on breast cancer control in Iran, our ability to give a clear advice for breast cancer screening in Iran is limited. Iran should adopt a tailor-made strategy for mass screening with great emphasis on reducing the number of advanced stage tumours or "down-staging'. Combination of two approaches, clinical breast examination (CBE) and mammography would be promising given the increased competence of health care professional and public awareness. Equally important, a control plan should be started small and expanded gradually