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Coronary Artery Dose-Volume Parameters Predict Risk of Calcification After Radiation Therapy.

Sarah A Milgrom1, Bibin Varghese1, Gregory W Gladish2

  • 1Division of Radiation Oncology, Department of Radiation Oncology, MD Anderson Cancer Center, Houston, TX, USA.

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Radiation therapy for thoracic cancers increases coronary artery disease risk. Radiation dose to coronary arteries is linked to coronary artery calcium (CAC) scoring, indicating early disease development.

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Area of Science:

  • Cardiology
  • Radiation Oncology
  • Radiology

Background:

  • Radiation exposure is a known risk factor for coronary artery disease (CAD).
  • 3D-planned radiation therapy (RT) for thoracic conditions may increase CAD risk.
  • Understanding the relationship between RT dose and CAD is crucial for patient management.

Purpose of the Study:

  • To investigate the association between coronary artery dose-volume parameters and coronary artery calcium (CAC) scores in patients treated with RT.
  • To determine if specific radiation dose metrics predict the development of coronary calcification after thoracic RT.

Main Methods:

  • Retrospective analysis of patients receiving thoracic RT with subsequent cardiac CT.
  • Collection of demographic data, cardiac risk factors, and dosimetric data for coronary arteries.
  • Calculation of coronary artery calcium (CAC) Agatston scores and statistical modeling using generalized linear mixed models and ROC analysis.

Main Results:

  • Twenty patients were included, with a median age of 53 years at RT.
  • CAC score was significantly associated with radiation dose and diabetes.
  • Segmental coronary artery dose parameters (e.g., V50) were significantly associated with CAC score > 0, with V50 showing the highest predictive value (AUC 0.89).

Conclusions:

  • Coronary artery radiation exposure is strongly correlated with subsequent segmental CAC score.
  • Coronary calcification can develop relatively soon after RT.
  • Individuals with conventional cardiac risk factors may be more susceptible to radiation-induced coronary calcification.