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Impact of radiation dose in postoperative radiotherapy after R1 resection for extrahepatic bile duct cancer: Long term results from a single institution

Title
Impact of radiation dose in postoperative radiotherapy after R1 resection for extrahepatic bile duct cancer: Long term results from a single institution
Authors
Kim B.H.Chie E.K.Kim K.Jang J.-Y.Kim S.W.Oh D.-Y.Bang Y.-J.Ha S.W.
Ewha Authors
김규보
SCOPUS Author ID
김규보scopus
Issue Date
2017
Journal Title
Oncotarget
ISSN
1949-2553JCR Link
Citation
Oncotarget vol. 8, no. 44, pp. 78076 - 78085
Keywords
Extrahepatic bile duct cancerPostoperative radiotherapyR1 resectionRadiation dose
Publisher
Impact Journals LLC
Indexed
SCIE; SCOPUS WOS scopus
Document Type
Article
Abstract
Purpose: This study was conducted to evaluate the impact of radiation dose after margin involved resection in patients with extrahepatic bile duct cancer. Methods: Among the 251 patients who underwent curative resection followed by adjuvant chemoradiotherapy, 86 patients had either invasive carcinoma (n = 63) or carcinoma in situ (n = 23) at the resected margin. Among them, 54 patients received conventional radiation dose (40-50.4 Gy) and 32 patients received escalated radiation dose (54-56 Gy). Results: Escalated radiation dose was associated with improved locoregional control (5yr rate, 73.8% vs. 47.1%, p = 0.069), but not disease-free survival (5yr rate, 43.4% vs. 32.6%, p = 0.490) and overall survival (5yr rate, 40.6% vs. 29.6%, p = 0.348). In multivariate analysis for locoregional control, invasive carcinoma at the margin (HR 2.957, p = 0.032) and escalated radiation dose (HR 0.394, p = 0.047) were independent prognostic factors. No additional gastrointestinal toxicity was observed in escalated dose group. Conclusions: Delivery of radiation dose ≥ 54 Gy was well tolerated and associated with improved locoregional control, but not with overall survival after margin involved resection. Further validation study is warranted. © Kim et al.
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DOI
10.18632/oncotarget.17368
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의과대학 > 의학과 > Journal papers
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