http://repub.eur.nl/res/aut/42644/ List of Publications en http://repub.eur.nl/static-eur/img/logo.png http://repub.eur.nl http://repub.eur.nl/res/pub/28992/ 2008-03-01T00:00:00Z Background: There is much debate on the necessity of regionalization of ovarian cancer care. We investigated the association between hospital type and survival of patients with ovarian cancer in The Netherlands. Methods: A retrospective, population-based cohort study was performed on all Dutch patients diagnosed with ovarian cancer from January 1, 1996, through December 31, 2003. We used data from the Netherlands Cancer Registry that were linked to mortality data from the Statistics Netherlands database to obtain the date and cause of death. Five-year relative survival ratios, defined as the ratio of the observed survival in the patient population to the expected survival of women in the general population with the same age, were determined for the total population and for groups stratified by tumor stage and/or hospital type. The association between hospital type and disease-specific survival was analyzed by use of multivariable Cox regression analyses. Results: We analyzed data from 8621 women with epithelial ovarian cancer, of whom 3482 (40%) were treated in general hospitals, 3510 (41%) were treated in semispecialized hospitals, and 1557 (18%) were treated in specialized hospitals. Five-year relative overall survival ratios of patients treated in general, semispecialized, and specialized hospitals were 38.0% (95% confidence interval [CI] = 36.0% to 39.9%), 39.4% (95% CI = 37.5% to 41.4%), and 40.3% (95% CI = 37.4% to 43.1%), respectively; median survival of patients aged 50-75 years was 36 months (interquartile range [IQR] = 13 to >54 months), 37 months (IQR = 14 to >54 months), and 38 months (IQR = 15 to >55 months), respectively. Age and cancer stage were associated with the relationship between hospital type and ovarian cancer-specific survival but histologic tumor type, grade, year of diagnosis, and socioeconomic status were not. Among patients with early-stage ovarian cancer, treatment in semispecialized and specialized hospitals was associated with lower risks of ovarian cancer-specific mortality than treatment in general hospitals. Among patients with stage I-IIA disease who were aged 50-75 years, risk of ovarian cancer-specific mortality was 30% and 42% lower after treatment in semispecialized and specialized hospitals, respectively, than in general hospitals (for semispecialized hospitals, hazard ratio [HR] = 0.70, 95% CI = 0.53 to 0.93; for specialized hospitals, HR = 0.58, 95% CI = 0.38 to 0.87). Among patients with advanced ovarian cancer, hospital type was not associated with survival. Conclusion: Hospital type was statistically significantly associated with survival among Dutch ovarian cancer patients with early-stage ovarian cancer: Patients who were treated in specialized and semispecialized hospitals survived longer than patients treated in general hospitals. http://repub.eur.nl/res/pub/36914/ 2007-05-01T00:00:00Z http://repub.eur.nl/res/pub/36946/ 2007-01-01T00:00:00Z Objectives: The aim of this study was to evaluate whether the efficiency of the current diagnostic work up following postmenopausal bleeding could be improved by diagnostic strategies that take into account characteristics of the women in addition to the currently recommended transvaginal measurement of endometrial thickness to determine for subsequent histological assessment. Design: Multicenter, prospective cohort study. Setting: A university hospital and seven teaching hospitals in the Netherlands. Sample: Consecutive women not using hormone replacement therapy, presenting with postmenopausal bleeding. Methods: Five hundred and forty women underwent transvaginal sonography, and in case of endometrial thickness (double layer) above 4 mm, subsequent endometrial sampling was performed. Presence of carcinoma was ruled out by the absence of abnormalities in histological specimen or by an uneventful follow up of at least 6 months. Main outcome measures: Probability of endometrial carcinoma was estimated by multivariable logistic regression models. For each diagnostic strategy, we calculated diagnostic accuracy (area under receiver operating characteristic curve [AUC]), negative predictive value (NPV) and the number of diagnostic procedures. Results: A strategy with transvaginal sonography alone with a fixed threshold incorrectly classified 0.7% of the women as nonmalignant (NPV: 99.3% [98.5-100%]), with 97% sensitivity and 56% specificity. A strategy integrating characteristics of the women with transvaginal sonography could result in less false reassurances (NPV: 99.6% [99.2-100%]), with only marginal decrease in diagnostic procedures, or a minor increase in false reassurances (NPV: 99.0% [98.3-100%]), with a substantial reduction (15-20%) in the procedures. AUCs associated with these strategies could improve from 0.76 (0.73-0.79) for transvaginal sonography alone to 0.90 (0.87-0.93) for the integrated strategy. Conclusion: Taking into account the characteristics of the women could increase the efficiency of the diagnostic work up for postmenopausal bleeding.