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Clinical Outcomes of Thymic Carcinoma: The Role of Radiotherapy Combined with Multimodal Treatments

 Gowoon Yang  ;  Chang Young Lee  ;  Eun Young Kim  ;  Chang Geol Lee  ;  Min Hee Hong  ;  Byung Jo Park  ;  Hong In Yoon  ;  Kyung Hwan Kim  ;  Sang Hoon Lee  ;  Hwa Kyung Byun  ;  Jaeho Cho 
 CANCERS, Vol.15(8) : 2262, 2023-04 
Journal Title
Issue Date
combined modality therapy ; radiotherapy ; survival rate ; thymus neoplasms
Introduction: We aimed to identify the role of radiotherapy (RT) in the treatment of thymic carcinoma as well as the optimal RT target volume. Materials and Methods: This single-institution retrospective study included 116 patients diagnosed with thymic carcinoma between November 2006 and December 2021 who received multimodal treatment including RT with or without surgery or chemotherapy. Seventy-nine patients (68.1%) were treated with postoperative RT, 17 patients (14.7%) with preoperative RT, 11 patients (9.5%) with definitive RT, and nine patients (7.8%) with palliative RT. The target volume was defined as the tumor bed or gross tumor with margin, and selective irradiation of the regional nodal area was performed when involved. Results: With a median follow-up of 37.0 (range, 6.7–174.3) months, the 5-year overall survival (OS), progression-free survival, and local recurrence-free survival rates were 75.2%, 47.7% and 94.7%, respectively. The 5-year OS was 51.9% in patients with unresectable disease. Overall, 53 recurrences were observed, of which distant metastasis was the most common pattern of failure (n = 32, 60.4%) after RT. No isolated infield or marginal failures were observed. Thirty patients (25.8%) who had lymph node metastases at the initial diagnosis had regional nodal areas irradiated. There was no lymph node failure inside the RT field. A tumor dimension of ≥5.7 cm (hazard ratio [HR] 3.01; 95% confidence interval [CI] 1.25–7.26; p = 0.030) and postoperative RT (HR 0.20; 95% CI 0.08–0.52; p = 0.001) were independently associated with OS. Intensity-modulated-RT-treated patients developed less overall toxicity (p < 0.001) and esophagitis (p < 0.021) than three-dimensional-conformal-RT-treated patients. Conclusions: A high local control rate was achieved with RT in the primary tumor sites and involved lymph node area in the treatment of thymic carcinoma. A target volume confined to the tumor bed or gross tumor plus margin with the involved lymph node stations seems reasonable. The advanced RT techniques with intensity-modulated RT have led to reduced RT-related toxicity.
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Appears in Collections:
1. College of Medicine (의과대학) > Dept. of Internal Medicine (내과학교실) > 1. Journal Papers
1. College of Medicine (의과대학) > Dept. of Radiation Oncology (방사선종양학교실) > 1. Journal Papers
1. College of Medicine (의과대학) > Dept. of Thoracic and Cardiovascular Surgery (흉부외과학교실) > 1. Journal Papers
Yonsei Authors
Kim, Kyung Hwan(김경환)
Kim, Eun Young(김은영) ORCID logo https://orcid.org/0000-0002-3281-5744
Park, Byung Jo(박병조)
Byun, Hwa Kyung(변화경) ORCID logo https://orcid.org/0000-0002-8964-6275
Yang, Gowoon(양고운)
Yoon, Hong In(윤홍인) ORCID logo https://orcid.org/0000-0002-2106-6856
Lee, Sang Hoon(이상훈) ORCID logo https://orcid.org/0000-0002-7706-5318
Lee, Chang Geol(이창걸) ORCID logo https://orcid.org/0000-0002-8702-881X
Lee, Chang Young(이창영)
Cho, Jae Ho(조재호) ORCID logo https://orcid.org/0000-0001-9966-5157
Hong, Min Hee(홍민희) ORCID logo https://orcid.org/0000-0003-3490-2195
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