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Risk for distant recurrence of breast cancer detected by mammography screening or other methods

  • 0Department of Oncology, Helsinki University Central Hospital, Helsinki, Finland. heikki.joensuu@hus.fi
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September 2, 2004

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September 2, 2004

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Summary

This summary is machine-generated.

Mammography screening detects breast cancer with a better prognosis than cancers found otherwise. This study shows screening reduces distant recurrence risk, suggesting current risk estimations may overestimate it.

Area Of Science

  • Oncology
  • Radiology
  • Public Health

Background

  • Breast cancer treatment selection relies on recurrence risk estimation.
  • Mammography screening is assumed to detect tumors with similar recurrence risk as other methods.
  • This study investigates if detection method impacts breast cancer prognosis.

Purpose Of The Study

  • To compare recurrence risk and survival in breast cancers detected by mammography screening versus other methods.
  • To evaluate the prognostic impact of mammography screening in breast cancer patients.

Main Methods

  • Retrospective analysis of 2842 breast cancer cases from the Finnish Cancer Registry (1991-1992).
  • Comparison of clinical, histopathological, and biological features of screen-detected vs. non-screen-detected tumors.
  • Analysis of ERBB2, TP53, and MK167 expression, and ERBB2 amplification using immunohistochemistry and in situ hybridization.
  • Univariate and multivariate analyses for distant recurrence and 10-year survival with a median 9.5-year follow-up.

Main Results

  • Screen-detected tumors showed significantly better 10-year distant disease-free survival across multiple size categories compared to non-screen-detected tumors.
  • Multivariate analysis revealed mammography screening as an independent prognostic variable, significantly reducing distant recurrence risk (HR 1.90).
  • The protective effect of mammography screening on recurrence risk was comparable to a 1-cm decrease in tumor diameter.

Conclusions

  • Breast cancers detected via mammography screening have a better prognosis than similarly sized tumors found through other detection methods.
  • The risk of distant metastases is likely overestimated for screen-detected breast cancers if the detection method is not considered.
  • Risk stratification models for breast cancer adjuvant therapy should incorporate the detection method to improve accuracy.

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