Willem A J van Daal

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There are several instruments to assess how patients evaluate their medical treatment choice. These are used to evaluate decision aids. Our objective is to investigate which psychological factors play a role when patients evaluate their medical treatment choices. A pool of 36 items was constructed, covering concepts such as uncertainty about and(More)
To evaluate the impact of BRCA1/2 testing and disclosure of a positive test result on women affected and unaffected with cancer. Longitudinal cohort study including women affected and unaffected with breast or ovarian cancer testing for a BRCA1/2 mutation. Data on well-being (anxiety, depression, cancer related distress, general health), treatment choice,(More)
PURPOSE Physicians hold opinions about unvoiced patient preferences, so-called substitute preferences. We studied whether doctors can predict preferences of patients supported with a decision aid. METHODS A total of 150 patients with prostate cancer facing radiotherapy were included. After the initial consultation, without discussing any treatment choice,(More)
A clinical decision analysis was performed to judge the impact of local recurrences after breast-conserving treatment (BCT) on the (quality-adjusted) life expectancy of breast cancer patients. A life-long follow-up of two patient groups, one of which had undergone mastectomy and one BCT, was simulated by a Markov model of medical prognosis. Data used in the(More)
BACKGROUND Women suspected to have the BRCA1/2 mutation may choose between two management options: breast cancer screening and prophylactic mastectomy (PM). OBJECTIVES To compare women's treatment choices with medical and decision-analytic recommendations and to explore variables related to the women's choices. METHODS After provision of information,(More)
According to prospect theory, risk attitude changes depending on whether a prospect is perceived as a gain or a loss relative to a reference or aspiration level. To investigate risk attitude with respect to years of life, the authors elicited utilities at two occasions by the certainty equivalent method from 30 women from the general population. The(More)
Decision analysis was used to evaluate the results of treatment of T2N0M0 glottic carcinoma as presented in the literature. Based on mean values for recurrence, salvage eligibility after recurrence and salvage success, the 5-year survival after radiotherapy and surgery proved to be almost identical, 85 and 86%. If the recurrence rates and the salvage rates(More)
PURPOSE BRCA1 mutation carriers have a high risk of developing breast and ovarian cancer. Carriers may opt for prophylactic surgery and screening. Recent data suggesting that prophylactic oophorectomy reduces breast cancer risk have been incorporated in a decision analysis. METHODS A Markov model was developed to compare LE and QALE following four(More)
PURPOSE To evaluate a shared decision-making intervention (SDMI) for BRCA1/2 mutation carriers who have to make a choice between screening and prophylactic surgery for breasts and/or ovaries. PATIENTS AND METHODS The SDMI consisted of two value assessment sessions, using the time trade-off method, followed by individualized treatment information based on(More)