J Natl Cancer Inst Monogr. 1997;(22):37-41.

The Canadian National Breast Screening Study: update on breast cancer mortality.

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National Breast Screening Study, Department of Public Health Sciences, University of Toronto, Canada.

Abstract

The Canadian National Breast Screening Study (CNBSS), conducted on women age 40-49, was designed to evaluate the efficacy of combined annual mammography and physical examination of the breasts in reducing breast cancer mortality in comparison to usual care (UC) controls. From January 1980 through March 1985, 25,214 women were individually randomized to the mammography/physical exam (MP) arm and 25,216 to the UC. The integrity of the randomization has been reviewed and confirmed to be unbiased. During an average, follow-up of 10.5 years from entry (range: 8.75-13 years), 82 women died from breast cancer in the MP arm and 72 in the UC, for a rate ratio of 1.14 (95% confidence interval: 0.83-1.56). All-cause mortality was almost identical comparing the two groups; the nonsignificant excess of breast cancer deaths in the MP arm was balanced by an excess of other cancer deaths in the UC arm.

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