Published in:
Open Access
01-12-2014 | Research
Risk of secondary cancers from scattered radiation during intensity-modulated radiotherapies for hepatocellular carcinoma
Authors:
Dong Wook Kim, Kwangzoo Chung, Weon Kuu Chung, Sun Hyun Bae, Dong Oh Shin, Seongeon Hong, Sung Ho Park, Sung-Yong Park, Chae-Seon Hong, Young Kyung Lim, Dongho Shin, Se Byeong Lee, Hyun-ho Lee, Jiwon Sung, Myonggeun Yoon
Published in:
Radiation Oncology
|
Issue 1/2014
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Abstract
Purpose
To evaluate and compare the risks of secondary cancers from therapeutic doses received by patients with hepatocellular carcinoma (HCC) during intensity-modulated radiotherapy (IMRT), volumetric arc therapy (VMAT), and tomotherapy (TOMO).
Methods
Treatments for five patients with hepatocellular carcinoma (HCC) were planned using IMRT, VMAT, and TOMO. Based on the Biological Effects of Ionizing Radiation VII method, the excess relative risk (ERR), excess absolute risk (EAR), and lifetime attributable risk (LAR) were evaluated from therapeutic doses, which were measured using radiophotoluminescence glass dosimeters (RPLGDs) for each organ inside a humanoid phantom.
Results
The average organ equivalent doses (OEDs) of 5 patients were measured as 0.23, 1.18, 0.91, 0.95, 0.97, 0.24, and 0.20 Gy for the thyroid, lung, stomach, liver, small intestine, prostate (or ovary), and rectum, respectively. From the OED measurements, LAR incidence were calculated as 83, 46, 22, 30, 2 and 6 per 104 person for the lung, stomach, normal liver, small intestine, prostate (or ovary), and rectum.
Conclusions
We estimated the secondary cancer risks at various organs for patients with HCC who received different treatment modalities. We found that HCC treatment is associated with a high secondary cancer risk in the lung and stomach.