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Related Experiment Videos

Survival from contralateral breast cancer.

C K Gajalakshmi1, V Shanta, M Hakama

  • 1Division of Epidemiology and Cancer Registry, Cancer Institute (WIA), Chennai, Tamilnadu, India. gaja_1@hotmail.com

Breast Cancer Research and Treatment
|February 16, 2000
PubMed
Summary
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This study on unilateral breast cancer (UBC) and contralateral breast cancer (CBC) found that while CBC patients were diagnosed younger and had more family history, survival rates were similar. Age at diagnosis emerged as a key prognostic factor.

Area of Science:

  • Oncology
  • Epidemiology
  • Clinical Research

Background:

  • Understanding the characteristics and outcomes of second primary breast cancers is crucial for improving patient management.
  • Previous studies have explored risk factors and survival for unilateral breast cancer (UBC).
  • Data on contralateral breast cancer (CBC) incidence and prognosis following an initial UBC diagnosis are less established.

Purpose of the Study:

  • To analyze and compare the clinical characteristics and survival outcomes of patients with unilateral breast cancer (UBC) and those who develop contralateral breast cancer (CBC).
  • To identify prognostic factors influencing survival in patients with primary and second primary breast cancers.

Main Methods:

  • Retrospective cohort study of 3163 UBC patients diagnosed between 1960-1989 at the Cancer Institute, Chennai, India.

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  • Follow-up until December 31, 1994, to identify 67 cases of CBC.
  • Relative survival rates calculated using life table methods; multivariate analysis employed the proportional hazards model.

    • Main Results:

    • Patients who developed CBC were younger at initial diagnosis and had a higher family history of breast cancer compared to UBC patients.
    • Cumulative relative survival at 5 and 10 years for UBC was 51% and 41%, versus 47% and 30% for CBC, with no statistically significant difference.
    • Age at diagnosis was a significant independent prognostic factor for UBC; early stage disease and family history were associated with better survival in both UBC and CBC.

    Conclusions:

    • While clinical differences exist between UBC and CBC patients, their overall survival rates are comparable.
    • Age at diagnosis is a critical independent prognostic factor for breast cancer survival.
    • The findings suggest that early detection and consideration of family history are important for managing breast cancer patients, though the small sample size of second cancers warrants cautious interpretation.