Cancer-related microangiopathic hemolytic anemia (CR-MAHA) in a metastatic breast cancer patient with a germ-line ATM single nucleotide variant and an ESR1 fusion variant: insights from a case report on early diagnosis and improved outcomes - Summary - MDSpire

Cancer-related microangiopathic hemolytic anemia (CR-MAHA) in a metastatic breast cancer patient with a germ-line ATM single nucleotide variant and an ESR1 fusion variant: insights from a case report on early diagnosis and improved outcomes

  • By

  • Fengting Yan

  • Aimee Wu

  • Yufei Wang

  • Tanya Wahl

  • Zirui Wang

  • Cesar Gutierrez

  • Josiah Wagner

  • Alexa Dowdell

  • Alexandra Bartlett

  • Christopher Carney

  • Daniel Landis

  • Brian Piening

  • Henry Kaplan

  • July 7, 2026

  • 0 min

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Objective:

To present a case of cancer-related microangiopathic hemolytic anemia (CR-MAHA) in a patient with metastatic breast cancer, emphasizing the role of genomic variants in treatment outcomes.

Approach:
  • Case Presentation: A 39-year-old woman with a family history of breast and lung cancer presented with back pain and fatigue, leading to the diagnosis of CR-MAHA after a thorough diagnostic workup.
  • Genomic Testing: Genomic analysis revealed a germ-line ATM mutation and an ESR1 fusion variant, which may have implications for treatment.
  • Treatment: The patient was treated with doxorubicin and cyclophosphamide, resulting in an excellent clinical response and resolution of hemolytic anemia.
Key Findings:
  • CR-MAHA is a rare paraneoplastic syndrome with poor prognosis if not recognized early.
  • The patient exhibited significant hemolytic anemia and thrombocytopenia.
  • Genomic testing identified a pathogenic ATM mutation and an ESR1 fusion variant, which may influence treatment response.
Interpretation:

The case highlights the importance of early diagnosis and treatment of CR-MAHA in cancer patients.

Limitations:
  • The study is based on a single case report, limiting generalizability.
  • Further research is needed to understand the molecular mechanisms underlying CR-MAHA and to validate findings in larger cohorts.
Conclusion:

This case emphasizes the need for clinical vigilance and genomic investigation in patients with CR-MAHA.

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