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Breast Cancer Research and Treatment

, Volume 105, Issue 3, pp 347–357 | Cite as

Survival after bilateral breast cancer: results from a population-based study

  • Helena M. Verkooijen
  • Vanessa Chatelain
  • Gérald Fioretta
  • Georges Vlastos
  • Elisabetta Rapiti
  • André-Pascal Sappino
  • Christine Bouchardy
  • Pierre O. Chappuis
Epidemiology

Abstract

Background

Controversy exists on the impact of bilaterality of breast cancer on survival. We used population-based data to compare survival of women with unilateral versus bilateral breast cancer.

Patients and methods

At the Geneva cancer registry, we identified all 7,912 women diagnosed with invasive breast cancer between 1970 and 2002. Breast cancers were categorized as unilateral, synchronous bilateral (contralateral tumour diagnosed within six months after the first tumour) and metachronous bilateral (contralateral tumour diagnosed over six months after the first tumour). With multivariate modelling we compared characteristics and survival between women with unilateral and bilateral disease.

Results

Patients with synchronous bilateral tumours (n = 155, 2.0%) had more often lobular histology and less frequently stage I disease than women with unilateral disease. Women with metachronous breast cancer (n = 219, 2.8%) received less often chemotherapy or hormone therapy for their first tumours. Ten-year disease-specific survival was similar (66%) after unilateral and metachronous bilateral breast cancer, but worse after synchronous bilateral cancer (51%). After adjustment, breast cancer mortality risks were not significantly increased for women with either synchronous or metachronous bilateral disease (Hazard ratios 1.1 (0.8–1.5) and 0.8 (0.5–1.4), respectively).

Conclusion

This large population-based study indicates that bilaterality of breast cancer is not associated with impaired survival.

Keywords

Bilateral Breast cancer Population-based Survival 

Notes

Acknowledgement

Helena M. Verkooijen was supported by PROSPER Grant (323-3069350) from the Swiss National Science Foundation.

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Copyright information

© Springer Science+Business Media, LLC 2006

Authors and Affiliations

  • Helena M. Verkooijen
    • 1
  • Vanessa Chatelain
    • 1
    • 2
  • Gérald Fioretta
    • 1
  • Georges Vlastos
    • 3
  • Elisabetta Rapiti
    • 1
  • André-Pascal Sappino
    • 2
  • Christine Bouchardy
    • 1
  • Pierre O. Chappuis
    • 2
    • 4
  1. 1.Geneva Cancer Registry, Institute for Social and Preventive MedicineGeneva UniversityGenevaSwitzerland
  2. 2.Division of Oncology, Department of Internal MedicineGeneva University HospitalsGeneva 14Switzerland
  3. 3.Senology and Surgical Gynecologic Oncology Unit, Department of Gynecology and ObstetricsGeneva University HospitalsGeneva 14Switzerland
  4. 4.Division of Medical Genetics, Department of Gynecology and ObstetricsGeneva University HospitalsGeneva 14Switzerland

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