title: Breast Cancer Risk and Progressive Histology in Serial Benign Biopsies.
abstract: More than 1 million women per year in the United States with benign breast biopsies are known to be at elevated risk for breast cancer (BC), with risk stratified on histologic categories of epithelial proliferation. Here we assessed women who had serial benign biopsies over time and how changes in the histologic classification affected BC risk.
  
  
  
  In the Mayo Clinic Benign Breast Disease Cohort of 13 466 women, 1414 women had multiple metachronous benign biopsies (10.5%). Both initial and subsequent biopsies were assessed histologically. BC risk for clinical and prognostic factors was assessed using subdistribution models to account for competing risks, and logistic regression/Wilcoxon/chi-square tests to assess covariates. All statistical tests were two-sided.
  
  
  
  Breast cancer risk for women with serial biopsies, stratified by histologic category in the later biopsies, was similar to women with a single biopsy. We found that changes in histological category between initial and subsequent biopsy statistically significantly impacted BC risk. Women with nonproliferative initial findings and subsequent proliferative findings had an increased risk (hazard ratio [HR] = 1.77, 95% confidence interval [CI] = 1.06 to 2.94, P = .03) compared with no change. Among women with proliferative disease without atypia at initial biopsy, risk decreased if later biopsy regressed to nonproliferative (HR = 0.49, 95% CI = 0.25 to 0.98) and increased if later biopsy showed progression to atypical hyperplasia (HR = 1.49, 95% CI = 0.73 to 3.05) compared with no change ( P = .04).
  
  
  
  We found that breast cancer risk increases in women with progressive epithelial proliferation over time and decreases in women whose biopsies show less proliferation. This finding has important implications for effective clinical management of the 100 000 women per year who have multiple benign breast biopsies.
authors.affiliation: Department of Laboratory Medicine and Pathology, Mayo Clinic Rochester, MN, USA.
authors.forename: Daniel W
authors.initials: DW
authors.lastname: Visscher
authors.affiliation: Departments of Health Science Research, Mayo Clinic Jacksonville, FL, USA.
authors.forename: Ryan D
authors.initials: RD
authors.lastname: Frank
authors.affiliation: Department of Laboratory Medicine and Pathology, Mayo Clinic Rochester, MN, USA.
authors.forename: Jodi M
authors.initials: JM
authors.lastname: Carter
authors.affiliation: Department of Health Sciences Research, Mayo Clinic Rochester, MN, USA.
authors.forename: Robert A
authors.initials: RA
authors.lastname: Vierkant
authors.affiliation: Department of Health Sciences Research, Mayo Clinic Rochester, MN, USA.
authors.forename: Stacey J
authors.initials: SJ
authors.lastname: Winham
authors.affiliation: Department of Health Sciences Research, Mayo Clinic Rochester, MN, USA.
authors.forename: Ethan P
authors.initials: EP
authors.lastname: Heinzen
authors.affiliation: Department of Health Sciences Research, Mayo Clinic Rochester, MN, USA.
authors.forename: Brendan T
authors.initials: BT
authors.lastname: Broderick
authors.affiliation: Department of Information Technology, Mayo Clinic Rochester, MN, USA.
authors.forename: Lori A
authors.initials: LA
authors.lastname: Denison
authors.affiliation: Department of Oncology, Mayo Clinic Rochester, MN, USA.
authors.forename: Teresa M
authors.initials: TM
authors.lastname: Allers
authors.affiliation: Department of Oncology, Mayo Clinic Rochester, MN, USA.
authors.forename: Joanne L
authors.initials: JL
authors.lastname: Johnson
authors.affiliation: Department of Oncology, Mayo Clinic Rochester, MN, USA.
authors.forename: Marlene H
authors.initials: MH
authors.lastname: Frost
authors.affiliation: Department of Oncology, Mayo Clinic Rochester, MN, USA.
authors.forename: Lynn C
authors.initials: LC
authors.lastname: Hartmann
authors.affiliation: Department of Surgery, Mayo Clinic Rochester, MN, USA.
authors.forename: Amy C
authors.initials: AC
authors.lastname: Degnim
authors.affiliation: Cancer Biology, Mayo Clinic Jacksonville, FL, USA.
authors.forename: Derek C
authors.initials: DC
authors.lastname: Radisky
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D001706:Biopsy; D001941:Breast Diseases / Q000150:complications / Q000175:diagnosis / Q000453:epidemiology / Q000473:pathology*; D001943:Breast Neoplasms / Q000175:diagnosis / Q000453:epidemiology / Q000209:etiology* / Q000473:pathology; D015331:Cohort Studies; D018450:Disease Progression; D005260:Female; D006801:Humans; D008875:Middle Aged; D011230:Precancerous Conditions / Q000175:diagnosis / Q000453:epidemiology / Q000473:pathology*; D011379:Prognosis; D012307:Risk Factors; D055815:Young Adult