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High risk of contralateral breast carcinoma in women with hereditary/familial non-BRCA1/BRCA2 breast carcinoma

  1. Katarina Shahedi M.D.1,
  2. Monica Emanuelsson R.N.1,
  3. Fredrik Wiklund Ph.D.1,2,
  4. Henrik Gronberg M.D., Ph.D.1,2,†,*

Article first published online: 13 FEB 2006

DOI: 10.1002/cncr.21753

Issue

Cancer

Cancer

Volume 106, Issue 6, pages 1237–1242, 15 March 2006

Additional Information

How to Cite

Shahedi, K., Emanuelsson, M., Wiklund, F. and Gronberg, H. (2006), High risk of contralateral breast carcinoma in women with hereditary/familial non-BRCA1/BRCA2 breast carcinoma. Cancer, 106: 1237–1242. doi: 10.1002/cncr.21753

Author Information

  1. 1

    Department of Radiation Sciences/Oncology, University of Umeå, Umeå, Sweden

  2. 2

    Department of Medical Epidemiology and Biostatistics, Karolinska Institute, Stockholm, Sweden

  1. †

    Fax: (011) 46 8314975

*Department of Medical Epidemiology and Biostatistics, Karolinska Institute, Box 281, SE-171 77 Stockholm, Sweden

  1. †

    Fax: (011) 46 8314975

Publication History

  1. Issue published online: 2 MAR 2006
  2. Article first published online: 13 FEB 2006
  3. Manuscript Accepted: 19 OCT 2005
  4. Manuscript Revised: 10 OCT 2005
  5. Manuscript Received: 9 JUN 2005

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Keywords:

  • breast carcinoma;
  • epidemiology;
  • contralateral;
  • hereditary;
  • family history

Abstract

BACKGROUND

The objectives of the current study were to estimate the risk of developing contralateral breast carcinoma (CBC) among women with hereditary/familial non-BRCA1/BRCA2 breast carcinoma and to determine the factors that may predict their risk of CBC.

METHODS

The study sample consisted of all families (n = 217 families) that were referred between 1994–2001 to the Clinic of Cancer Genetics at the University Hospital of Umeå for suspected hereditary breast carcinoma. The study included all women in the 217 families who had carcinoma of the breast as their first primary invasive malignancy diagnosed between 1970–2001 in northern Sweden. Exclusion criteria were an estimated lifetime risk < 20%, BRCA1/BRCA2 mutation, noninvasive carcinoma (ductal or lobular carcinoma in situ), and bilateral breast carcinoma. In the final analysis, 204 women were included from 120 families.

RESULTS

The cumulative probability of developing CBC among women who had hereditary/familial non-BRCA1/BRCA2 breast carcinoma after 20 years was 27.3% (95% confidence interval, 15.0–37.8) compared with the expected risk (4.9%) among women in northern Sweden who had primary breast carcinoma. A significantly increased risk of CBC was associated with age younger than 50 years at the time of diagnosis of the first primary breast carcinoma (P = 0.006). Adjuvant hormone therapy reduced the risk of CBC (P = 0.036).

CONCLUSIONS

Women with hereditary/familial non-BRCA1/BRCA2 breast carcinoma had a high risk of developing CBC. This risk was attenuated further among women who were younger at the time of onset, who had a cumulative probability of developing CBC of nearly 40% after 15 years, which is similar to the estimated risk among BRCA1/BRCA2 mutation carriers. The results of this study emphasized the importance of genetic counseling for these women. Cancer 2006. © 2006 American Cancer Society.

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