Complementary approaches to assessing risk factors for interval breast cancer

To examine risk factors for interval breast cancer among women screened in a population-based mammography program. Risk for interval cancer was assessed in terms of both the incidence per 10,000 negative screens and the proportion of all breast cancers diagnosed among screened women. Interval (N = 557) and screen-detected cancers (N = 1,545) were identified among 208,667 women receiving mammography in Colorado (1994–2001). Logistic regression was used to assess independent effects of multiple factors. Overall risk of interval cancer was 29.5/10,000 women screened. Incidence was higher in women >50 years (OR: 2.28, 1.86–2.80), with family history (OR: 2.23, 1.85–2.70), with dense breasts (OR: 3.84, 2.76–5.35), and using hormones (OR: 1.54, 1.20–1.97). Hispanics had lower incidence than Whites (OR: 0.52, 0.34–0.81). Interval cancers represented 26% of all cancers diagnosed. This proportion was higher in women