Natural history of invasive breast cancer suggests some cancers regress

November 26, 2008 Natural history of invasive breast cancer suggests some cancers regress By Rebekah Moan Unexpected findings from a study of Norwegian women who have and have not received routine biennial screening mammography suggest some breast cancers may spontaneously regress. Dr. Per-Henrik Zahl, a senior statistician in the epidemiology department at the Norwegian Institute of Public Health in Oslo, and colleagues compared cumulative breast cancer incidence in age-matched cohorts of women residing in four Norwegian counties before and after the initiation of biennial mammography.

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