Oral contraceptive (OC) use has been linked to increased risk of breast cancer, largely on the basis of studies conducted before 1990. In the Case-Control Surveillance Study, a US hospital-based case-control study of medication use and cancer, the authors assessed the relation of OC use to breast cancer risk among 907 case women with incident invasive breast cancer (731 white, 176 black) and 1,711 controls (1,152 white, 559 black) interviewed from 1993 to 2007. They evaluated whether the association differed by ethnicity or tumor hormone receptor status. After control for breast cancer risk factors, the multivariable odds ratio for 1 year or more of OC use, relative to less than 1 year of use, was 1.5 (95% confidence interval: 1.2, 1.8). The estimates were similar within age strata (<50>
Lynn Rosenberg, Yuqing Zhang, Patricia F. Coogan, Brian L. Strom and Julie R. Palmer
Correspondence to Dr. Lynn Rosenberg, Slone Epidemiology Center at Boston University, 1010 Commonwealth Avenue, Boston, MA 02215 (e-mail: lrosenberg@slone.bu.edu
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Received for publication July 1, 2008. Accepted for publication October 10, 2008.
Correspondence to Dr. Lynn Rosenberg, Slone Epidemiology Center at Boston University, 1010 Commonwealth Avenue, Boston, MA 02215 (e-mail: lrosenberg@slone.bu.edu
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).
Received for publication July 1, 2008. Accepted for publication October 10, 2008.
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