Radiotherapy and oncology : journal of the European Society for Therapeutic Radiology and Oncology · 2016
Dosimetric analysis of upper gastrointestinal ulcer after carbon-ion radiotherapy for pancreatic cancer.
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Shinoto Makoto, Shioyama Yoshiyuki, Matsunobu Akira, Okamoto Kei, Suefuji Hiroaki, Toyama Shingo, Honda Hiroshi, Kudo Sho
Аннотация
PURPOSE: The aim of this study was to clarify the incidence, clinical risk factors, and dose-volume relationship of upper gastrointestinal (GI) ulcer after carbon-ion radiotherapy (C-ion RT) for pancreatic cancer.
MATERIALS AND METHODS: Fifty-eight pancreatic cancer patients were treated with C-ion RT from April 2014 to December 2015. The total dose was 55.2Gy (RBE) in 12 fractions. D2cm3 of GI tracts were restricted under 46Gy (RBE); RBE-weighted absorbed dose. The association between dosimetric parameters (V10-50, Dmax, D1cm3, D2cm3) and GI ulcer was examined using Spearman's correlation. The incidence of GI ulcer was compared between the two groups divided by the cutoff value.
RESULTS: Twelve patients (21%) experienced gastric ulcer including only one (2%) grade 3 ulcer. There was no grade 4/5 toxicity or duodenal ulcer. V10-30 was significantly associated with gastric ulcer. The 1-year estimated risk of gastric ulcer for the determined cutoff values were 51% vs. 10% (V10, ⩾102cm(3) or less), 42% vs. 9% (V20, ⩾24cm(3) or less), 34% vs. 4% (V30, ⩾6cm(3) or less).
CONCLUSIONS: The incidence of GI ulcer after C-ion RT was very low with the dose constraint of D2cm3 <46Gy (RBE). To further minimize the risk of GI ulcer, V10-30 should also be reduced.
MATERIALS AND METHODS: Fifty-eight pancreatic cancer patients were treated with C-ion RT from April 2014 to December 2015. The total dose was 55.2Gy (RBE) in 12 fractions. D2cm3 of GI tracts were restricted under 46Gy (RBE); RBE-weighted absorbed dose. The association between dosimetric parameters (V10-50, Dmax, D1cm3, D2cm3) and GI ulcer was examined using Spearman's correlation. The incidence of GI ulcer was compared between the two groups divided by the cutoff value.
RESULTS: Twelve patients (21%) experienced gastric ulcer including only one (2%) grade 3 ulcer. There was no grade 4/5 toxicity or duodenal ulcer. V10-30 was significantly associated with gastric ulcer. The 1-year estimated risk of gastric ulcer for the determined cutoff values were 51% vs. 10% (V10, ⩾102cm(3) or less), 42% vs. 9% (V20, ⩾24cm(3) or less), 34% vs. 4% (V30, ⩾6cm(3) or less).
CONCLUSIONS: The incidence of GI ulcer after C-ion RT was very low with the dose constraint of D2cm3 <46Gy (RBE). To further minimize the risk of GI ulcer, V10-30 should also be reduced.