Publication date: 1 June 2017
Source:International Journal of Radiation Oncology*Biology*Physics, Volume 98, Issue 2
Author(s): Joelle Helou, Isabelle Thibault, Ian Poon, Andrew Chiang, Suneil Jain, Hany Soliman, Darby Erler, Latifa Yeung, Patrick Cheung
PurposeTo assess the association between colorectal cancer (CRC) histology, dose, and local failure (LF) after stereotactic ablative radiation therapy (SABR) for pulmonary metastases, and to describe subsequent cancer progression, change of systemic therapy (CST), survival, and their association with treatment indications.Methods and MaterialsFrom a prospective SABR cohort, 180 pulmonary metastases in 120 patients were identified. Treatment indications were single metastasis, oligometastases, oligoprogression, and dominant areas of progression. Doses of 48 to 52 Gy/4 to 5 fractions were delivered. Since 2010 the dose for peripheral CRC metastases was increased to 60 Gy/4 fractions. Cumulative incidence function (CIF) was used to report LF, progression probability, and CST. The Kaplan-Meier method estimated overall survival (OS). Univariate and multivariable analyses to assess variable associations were conducted.ResultsMedian follow-up was 22 months (interquartile range, 14-33 months). At 24 months, the CIF of LF was 23.6% (95% confidence interval [CI] 15.1%-33.3%) and 8.3% (95% CI 2.6%-18.6%), respectively, for CRC and non-CRC metastases (P<.001). This association remained significant after adjusting for confounders (subdistribution hazard ratio [SHR] 13.6, 95% CI 4.2-44.1, P<.001). Among CRC metastases, 56 and 45 received <60 Gy and 60 Gy, respectively. Delivering 60 Gy was independently associated with a lower hazard of LF (SHR 0.271, 95% CI 0.078-0.940, P=.040). At 12 months the CIF of progression was 41.67% (95% CI 21.69%-60.56%), 42.51% (95% CI 29.09%-55.29%), 62.96% (95% CI 41.25%-78.53%), and 78.57% (95% CI 42.20%-93.48%), respectively, for patients treated for single metastasis, oligometastases, oligoprogression, and dominant area of progression (P<.001). A CST was observed, respectively, in 4 (17%), 17 (31%), 12 (44%), and 10 (71%) patients with a median time of 13.1, 11.1, 8.4, and 8.4 months.ConclusionColorectal cancer lung metastases are associated with a higher hazard of LF and require higher SABR doses. Outcomes for patients with oligometastases and oligoprogression treated with SABR seem favorable. Prospective clinical trials are needed to confirm these benefits.
http://ift.tt/2qiLzZn
Σφακιανάκης Αλέξανδρος
ΩτοΡινοΛαρυγγολόγος
Αναπαύσεως 5 Άγιος Νικόλαος
Κρήτη 72100
00302841026182
00306932607174
alsfakia@gmail.com
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