title: Accuracy of reports of familial breast cancer in a case-control series.
abstract: We examined pathology records to determine the accuracy of reports of breast cancer among 125 first-degree relatives by 414 breast cancer cases and 429 population-based controls. Cases who reported only one affected relative tended to overreport the occurrence of breast cancer to a slightly larger extent (4%) than controls (3%). One-third of reports by cases with at least two affected relatives were erroneous, compared with none in the control group. Both cases and controls committed absolute errors of approximately 2 years when reporting the age at diagnosis of relatives. These results indicate that some recall bias is introduced when self-reports of breast cancer occurrence in first-degree relatives are used in case-control studies.
authors.affiliation: Epidemiology Research Unit, Hôtel-Dieu de Montréal, Québec, Canada.
authors.forename: M E
authors.initials: ME
authors.lastname: Parent
authors.forename: P
authors.initials: P
authors.lastname: Ghadirian
authors.forename: A
authors.initials: A
authors.lastname: Lacroix
authors.forename: C
authors.initials: C
authors.lastname: Perret
mesh_terms: D001943:Breast Neoplasms / Q000453:epidemiology* / Q000235:genetics*; D016022:Case-Control Studies; D005260:Female; D006801:Humans; D015588:Observer Variation