Purpose: To investigate the dose-volume histogram parameters and clinical factors as predictors of pleural effusion in esophageal cancer patients treated with concurrent chemoradiotherapy (CRT).
Methods And Materials: Forty-three esophageal cancer patients treated with definitive CRT from January 2001 to March 2007 were reviewed retrospectively on the basis of the following criteria: pathologically confirmed esophageal cancer, available computed tomography scan for treatment planning, 6-month follow-up after CRT, and radiation dose ≥ 50 Gy. Exclusion criteria were lung metastasis, malignant pleural effusion, and surgery. Mean heart dose, mean total lung dose, and percentages of heart or total lung volume receiving ≥ 10-60 Gy (Heart-V(10) to V(60) and Lung-V(10) to V(60), respectively) were analyzed in relation to pleural effusion.
Results: The median follow-up time was 26.9 months (range, 6.7-70.2) after CRT. Of the 43 patients, 15 (35%) developed pleural effusion. By univariate analysis, mean heart dose, Heart-V(10) to V(60), and Lung-V(50) to V(60) were significantly associated with pleural effusion. Poor performance status, primary tumor of the distal esophagus, and age ≥ 65 years were significantly related with pleural effusion. Multivariate analysis identified Heart-V(50) as the strongest predictive factor for pleural effusion (p = 0.01). Patients with Heart-V(50) <20%, 20%≤ Heart-V(50) <40%, and Heart-V(50) ≥ 40% had 6%, 44%, and 64% of pleural effusion, respectively (p < 0.01).
Conclusion: Heart-V(50) is a useful parameter for assessing the risk of pleural effusion and should be reduced to avoid pleural effusion.
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