Abstract
The clinical information on the relationship between the cardiac contact distance (CCD), the maximum dose (Dmax) delivered to the left anterior descending (LAD) coronary artery and the mean heart dose has mostly focused on patients with breast-conserving surgery (BCS), being scarce in postmastectomy patients. The aim of this study is to determine the association between the CCD and the Dmax delivered to the LAD. The secondary objective was to evaluate the dosimetric results of comparing three-dimensional conformal radiotherapy (3D-CRT) to intensity-modulated radiotherapy (IMRT) and volumetric modulated arc therapy (VMAT) techniques for post mastectomized breast cancer patients with irradiation to the left chest wall. 53 cases of women who received adjuvant standard fractionated postmastectomy radiotherapy (PMRT) were used. Three types of plans were created for each patient: 3D-CRT, seven equidistant IMRT fields, and four partial VMAT arcs. Correlations were evaluated using Pearson’s correlation coefficient. Plans made with IMRT and VMAT showed improved homogeneity and conformity. Associations between CCD and Dmax to LAD were positive for all three plan types. Compared to 3D-CRT, the modulated intensity plans obtained better dose homogeneity and conformity to the target volume. The LAD and heart doses were significantly lower for IMRT and VMAT plans. The CCD can be used as a predictor of the maximum and mean doses of the LAD. Modulated intensity techniques allow for better dose distribution and dose reduction to the heart and LAD.
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The data that support the findings of this study are available from the corresponding author E.A Martín-Tovar, upon reasonable request.
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The authors thank the Radiotherapy Department (radiation oncologists, medical physicists, dosimetrists, radiation therapists, nurses and administrative personnel) of IMSS-UMAE Mérida for their work and invaluable collaboration.
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Badillo-Alvarado, A.H., Martín-Tovar, E.A., Molina-Salinas, G.M. et al. Association between the cardiac contact distance and the maximum dose at the left anterior descending coronary artery in post mastectomized patients. Radiat Environ Biophys 61, 407–423 (2022). https://doi.org/10.1007/s00411-022-00983-5
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DOI: https://doi.org/10.1007/s00411-022-00983-5