PITX2 DNA-Methylation: Predictive versus Prognostic Value for Anthracycline-Based Chemotherapy in Triple-Negative Breast Cancer Patients

Rudolf Napieralski, Gabriele Schricker, Gert Auer, Michaela Aubele, Jonathan Perkins, Viktor Magdolen, Kurt Ulm, Moritz Hamann, Axel Walch, Wilko Weichert, Marion Kiechle, Olaf G. Wilhelm

Research output: Contribution to journalArticlepeer-review

3 Scopus citations

Abstract

Background: PITX2 DNA methylation has been shown to predict outcomes in high-risk breast cancer patients after anthracycline-based chemotherapy. To determine its prognostic versus predictive value, the impact of PITX2 DNA methylation on outcomes was studied in an untreated cohort vs. an anthracycline-treated triple-negative breast cancer (TNBC) cohort. Material and Methods: The percent DNA methylation ratio (PMR) of paired-like homeodomain transcription factor 2 (PITX2) was determined by a validated methylation-specific real-time PCR test. Patient samples of routinely collected archived formalin-fixed paraffin-embedded (FFPE) tissue and clinical data from 144 TNBC patients of 2 independent cohorts (i.e., 66 untreated patients and 78 patients treated with anthracycline-based chemotherapy) were analyzed. Results: The risk of 5- and 10-year overall survival (OS) increased continuously with rising PITX2 DNA methylation in the anthracycline-treated population, but it increased only slightly during 10-year follow-up time in the untreated patient population. PITX2 DNA methylation with a PMR cutoff of 2 did not show significance for poor vs. good outcomes (OS) in the untreated patient cohort (HR = 1.55; p = 0.259). In contrast, the PITX2 PMR cutoff of 2 identified patients with poor (PMR >2) vs. good (PMR ≤2) outcomes (OS) with statistical significance in the anthracycline-treated cohort (HR = 3.96; p = 0.011). The results in the subgroup of patients who did receive anthracyclines only (no taxanes) confirmed this finding (HR = 5.71; p = 0.014). Conclusion: In this hypothesis-generating study PITX2 DNA methylation demonstrated predominantly predictive value in anthracycline treatment in TNBC patients. The risk of poor outcome (OS) correlates with increasing PITX2 DNA methylation.

Original languageEnglish
Pages (from-to)523-531
Number of pages9
JournalBreast Care
Volume16
Issue number5
DOIs
StatePublished - 1 Oct 2021
Externally publishedYes

Keywords

  • Anthracyclines
  • Biomarker
  • Chemotherapy
  • DNA methylation
  • Homeodomain proteins/genetics
  • PITX2
  • Therapy prediction
  • Treatment outcome
  • Triple-negative breast cancer/neoplasms
  • Tumor/genetics

Fingerprint

Dive into the research topics of 'PITX2 DNA-Methylation: Predictive versus Prognostic Value for Anthracycline-Based Chemotherapy in Triple-Negative Breast Cancer Patients'. Together they form a unique fingerprint.

Cite this