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From INSERM U 360 (Drs. Elbaz, Alpérovitch, and Tzourio), Recherches Epidémiologiques en Neurologie et Psychopathologie, Hôpital de la Salpêtrière, Paris, France; Institute of Hygiene (Dr. Grigoletto), University of Padua, Padova, Italy; Targeted Project on Aging (Dr. Baldereschi), National Research Council, Florence, Italy; Department of Epidemiology and Biostatistics (Dr. Breteler), Erasmus University Medical School, Rotterdam, the Netherlands; Department of Neurology (Dr. Manubens-Bertran, University of Navarra, Pamplona, Spain; Department of Neurology (Dr. Lopez-Pousa), University Hospital Sta. Caterina, Girona, Spain; Department of Neurology (Dr. Dartigues), Pellegrin Hospital, University of Bordeaux II, France; and the Departments of Health Sciences Research and Neurology (Dr. Rocca), Mayo Clinic and Mayo Foundation, Rochester, MN.
Address correspondence and reprint requests to Dr A. Elbaz, INSERM U 360, Recherches Epidémiologiques en Neurologie et Psychopathologie, Hôpital de la Salpêtrière, 75651 Paris Cedex 13, France; e-mail: elbaz{at}ccr.jussieu.fr
OBJECTIVE: To investigate the familial aggregation of PD in a large collaborative population-based case-control study.
BACKGROUND: Most previous case-control studies of the familial aggregation of PD have been hospital- or clinic-based.
METHODS: We included 219 prevalent cases ascertained in three European populations (centers), using a two-phase design consisting of screening and examination by a neurologist. Each case was matched by age, sex, and center to three controls drawn from the same populations (n = 657). Presence of PD among first-degree relatives (parents and siblings) was determined using the family history approach for 175 cases and 481 controls.
RESULTS: Overall, a positive family history (at least one parent or sibling affected by PD) was reported in 10.3% of patients and 3.5% of controls (odds ratio [OR] = 3.2; 95% confidence interval [CI] = 1.6 to 6.6). A similar association was observed when analyses were restricted to nondemented patients and controls (OR = 3.9; 95% CI = 1.7 to 8.7) or to newly diagnosed patients (OR = 3.3; 95% CI = 0.9 to 11.9). We found a significant trend of increasing risk with increasing number of affected relatives (p = 0.003). Analyses stratified by age showed a stronger association for younger PD patients (OR = 7.6; 95% CI = 1.5 to 38.9) than for older patients (OR = 2.5; 95% CI = 1.1 to 5.7).
CONCLUSIONS: In this large sample of prevalent PD patients and population-matched controls, PD significantly aggregates in families, with the strength of the association being age-dependent. Therefore, familial factors, which can be genetic, environmental, or both, play a role in PD.
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