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Related Experiment Videos

Competing risks analyses for recurrence from primary breast cancer.

J W Chapman1, E B Fish, M A Link

  • 1Henrietta Banting Breast Centre, Women's College Hospital, University of Toronto, Ontario, Canada.

British Journal of Cancer
|April 3, 1999
PubMed
Summary

Prognostic factors significantly impact breast cancer recurrence. Adjuvant radiation reduced local recurrence, while age, tumor size, nodal status, and chemotherapy affected recurrence timing, suggesting endpoint interdependence.

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Area of Science:

  • Oncology
  • Biostatistics

Background:

  • Prognostic factors for breast cancer metastasis are typically analyzed independently.
  • Competing risks analysis offers a method to simultaneously evaluate factors influencing different recurrence types.

Purpose of the Study:

  • To investigate the impact of traditional prognostic factors and adjuvant therapies on the type and timing of first recurrence in primary invasive breast cancer.
  • To assess these effects in the overall patient cohort and specifically in older patients (aged 65 and above).

Main Methods:

  • Utilized competing risks analysis on a cohort of 678 primary invasive breast cancer patients (1971-1995).
  • Examined traditional factors: age, tumor size, nodal status, estrogen receptor (ER), progesterone receptor (PgR), and adjuvant therapies (hormones, chemotherapy, radiotherapy).

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  • Analyzed outcomes for type of first recurrence (local, regional, distant) and time to recurrence.

    • Main Results:

    • For all patients, adjuvant radiation therapy was associated with a reduced risk of local recurrence (P <= 0.05).
    • Age, nodal status, tumor size, and adjuvant chemotherapy significantly influenced both the type and timing of recurrence, particularly time to local and distant metastasis.
    • In patients aged 65+, only nodal status and tumor size significantly affected the time to recurrence, with no factors differentially impacting recurrence type.

    Conclusions:

    • Traditional prognostic factors and treatments exhibit significant associations with breast cancer recurrence patterns and timing, indicating potential interdependence of recurrence endpoints.
    • Findings highlight the importance of considering multiple recurrence types simultaneously in prognostic assessments.
    • Future research incorporating newer prognostic factors could refine understanding of their biological activity and clinical impact.