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Applying new Magee equations for predicting the Oncotype Dx recurrence score.

Maher Sughayer1, Rolla Alaaraj2, Ahmad Alsughayer3

  • 1Department of Pathology and Laboratory Medicine, King Hussein Cancer Center, 202 Queen Rania Street, Al-Jubeiha, P.O. Box 1269, Amman, 11941, Jordan. msughayer@khcc.jo.

Breast Cancer (Tokyo, Japan)
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PubMed
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New Magee equations can predict breast cancer recurrence risk using standard pathology. These user-friendly tools offer a reliable alternative for assessing risk in early-stage breast cancer patients.

Keywords:
Breast cancerEstimated recurrence scoreMagee EquationsOncotype Dx.

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Area of Science:

  • Oncology
  • Genomic Medicine
  • Biostatistics

Background:

  • Breast cancer is a leading cause of cancer in women.
  • The Oncotype Dx assay predicts recurrence risk in estrogen receptor-positive early breast cancer.
  • Chemotherapy benefits patients with high recurrence risk.

Purpose of the Study:

  • To evaluate the accuracy of three Magee equations in estimating the Oncotype Dx recurrence score.
  • To assess the correlation and concordance between Magee equation-derived scores and actual Oncotype Dx results.
  • To determine if Magee equations can effectively categorize patients into low, intermediate, and high-risk groups.

Main Methods:

  • Utilized clinicopathological parameters from 37 early breast cancer cases with existing Oncotype Dx results.
  • Estimated recurrence scores using three novel Magee equations.
  • Performed correlation analyses and calculated concordance rates between estimated and actual recurrence scores.
  • Categorized patients into risk groups based on estimated scores using standard Oncotype Dx cutoffs.

Main Results:

  • Pearson correlation coefficients (R) between estimated and actual recurrence scores were strong (0.73, 0.66, 0.70 for Magee equations 1, 2, and 3).
  • Concordance rates between estimated and actual scores ranged from 52.9% to 57.6%.
  • Magee equations accurately predicted most low and high recurrence risk cases with high correlation and minimal discordance.

Conclusions:

  • Magee equations provide a user-friendly method for predicting recurrence scores in early breast cancer.
  • These equations demonstrate strong correlation and concordance with the Oncotype Dx assay.
  • Magee equations offer a valuable tool for risk stratification in early breast cancer management.