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Delphi Diagnostics Announces New Publication in the European Journal of Cancer

The study of 659 PACS-01 samples found EAIRR added statistically significant prognostic and endocrine-predictive information beyond the 21-gene Recurrence Score.

  • On Wednesday, Delphi Diagnostics announced new clinical data published in the European Journal validating Recurrence Risk as a significant independent predictor of outcomes for hormone receptor-positive, node-positive breast cancer patients.
  • The study demonstrates that EAIRR, also known as SET2,3, provides meaningful prognostic and endocrine-predictive information beyond the 21-gene Recurrence Score, enhancing risk stratification for node-positive patients.
  • Researchers analyzed 659 patient samples from the PACS-01 clinical trial, establishing Level 1B evidence that EAIRR refines prognostic risk stratification beyond existing assays.
  • Data indicate EAI strongly predicted benefit from adjuvant endocrine therapy with interaction values below 0.001, enabling physicians to identify patients sensitive to treatment for personalized care decisions.
  • Delphi Diagnostics aims to make the EAI test available to patients, opening pathways for personalized breast cancer treatment, while developer Fraser Symmans maintains a financial relationship with the company managed by the Anderson Cancer Center's Interest Committee.
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Delphi Diagnostics Announces New Publication in the European Journal of Cancer

Peer-reviewed manuscript demonstrates the Endocrine Activity IndexTM Recurrence Risk (EAIRR) enhances risk stratification beyond Recurrence Score® and is predictive of endocrine therapy benefit

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PR Newswire broke the news in United States on Thursday, May 7, 2026.
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