<abstract xmlns="http://www.w3.org/1999/xhtml"><sec id="j_raon-2016-0050_s_001_w2aab3b8c22b1b7b1aab1c16b1Aa"><h3>Background</h3><p>Radiation-related lymphopenia has been associated with poor patient outcome. Our aim was to identify predictors of lymphopenia after palliative radiotherapy, with a focus on dose-volume parameters.</p></sec><sec id="j_raon-2016-0050_s_002_w2aab3b8c22b1b7b1aab1c16b2Aa"><h3>Patients and methods</h3><p>To retrospectively assess patients with various cancers who had undergone palliative radiotherapy, we delineated three organs at risk: the volume enclosed by the body surface contour (body A), the volume left after excluding air, pleural effusion, ascites, bile, urine, and intestinal content (body B), and the volume of the bone marrow (BM). We then noted the absolute volume of the three organs at risk that had received 5-30 Gy, and assessed the predictive value for post-treatment lymphopenia of grade 3 or higher (LP3+).</p></sec><sec id="j_raon-2016-0050_s_003_w2aab3b8c22b1b7b1aab1c16b3Aa"><h3>Results</h3><p>Of 54 patients, 23 (43%) developed LP3+. Univariate logistic regression analysis showed that body A V5, body A V10, body B V5, body B V10, the number of fractions, and splenic irradiation were significant predictors of LP3+ (p &lt; 0.05). By multivariate analysis, body A V5, body A V10, body B V5, body B V10, and the number of fractions retained significance (p &lt; 0.05). BM dose-volume parameters did not predict lymphopenia.</p></sec><sec id="j_raon-2016-0050_s_004_w2aab3b8c22b1b7b1aab1c16b4Aa"><h3>Conclusions</h3><p>Higher body A and body B dose-volume parameters and a larger number of fractions may be predictors of severe lymphopenia after palliative radiotherapy.</p></sec></abstract>

BackgroundRadiation-related lymphopenia has been associated with poor patient outcome. Our aim was to identify predictors of lymphopenia after palliative radiotherapy, with a focus on dose-volume parameters.Patients and methodsTo retrospectively assess patients with various cancers who had undergone palliative radiotherapy, we delineated three organs at risk: the volume enclosed by the body surface contour (body A), the volume left after excluding air, pleural effusion, ascites, bile, urine, and intestinal content (body B), and the volume of the bone marrow (BM). We then noted the absolute volume of the three organs at risk that had received 5-30 Gy, and assessed the predictive value for post-treatment lymphopenia of grade 3 or higher (LP3+).ResultsOf 54 patients, 23 (43%) developed LP3+. Univariate logistic regression analysis showed that body A V5, body A V10, body B V5, body B V10, the number of fractions, and splenic irradiation were significant predictors of LP3+ (p < 0.05). By multivariate analysis, body A V5, body A V10, body B V5, body B V10, and the number of fractions retained significance (p < 0.05). BM dose-volume parameters did not predict lymphopenia.ConclusionsHigher body A and body B dose-volume parameters and a larger number of fractions may be predictors of severe lymphopenia after palliative radiotherapy.

Dosimetric predictors of treatment-related lymphopenia induced by palliative radiotherapy: predictive ability of dose-volume parameters based on body surface contour

Radiology and Oncology

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BackgroundRadiation-related lymphopenia has been associated with poor patient outcome. Our aim was to identify predictors of lymphopenia after palliative...

Dosimetric predictors of treatment-related lymphopenia induced by palliative radiotherapy: predictive ability of dose-volume parameters based on body surface contour

Article Category: Research Articles

Publicado en línea: 13 oct 2016

Páginas: 228 - 234

Recibido: 18 jul 2016

Aceptado: 30 ago 2016

DOI: https://doi.org/10.1515/raon-2016-0050

© 2017 Tetsuo Saito, Ryo Toya, Tomohiko Matsuyama, Akiko Semba, Natsuo Oya

This article is distributed under the terms of the Creative Commons Attribution Non-Commercial License, which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.