Beth Israel Deaconess Medical Center, Boston, MA
Rabia N Dagoglu , Mark Callery , James Moser , Jennifer F. Tseng , Tara Kent , Andrea J. Bullock , Rebecca A. Miksad , Joseph Douglas Mancias , Anand Mahadevan
Background: After adjuvant or definitive radiation for pancreas cancer, there are limited conventional treatment options for recurrent pancreas cancer. We explored the role of (Stereotactic Body Radiotherapy) SBRT for reirradiation of recurrent pancreas cancer. Methods: Our institutional IRB approved database was retrospectively reviewed. All patients were deemed unresectable and treated with systemic therapy. Fiducial gold markers were used. CT simulation was performed with oral and IV contrast and patients were treated with respiratory motion tracking.The choice of fractionation was based on tumor volume, location of the tumor and prior radiation dose, interval between prior RT, adjacent normal tissue, patients’ performance status and co morbidities. The irradiation dose was prescribed to the isodose line covering at least 95% of the target volume. Maximum point dose to the gastric and duodenal walls was kept at or below prescription dose. Results: This study included 30 patients reirradiated for recurrent pancreas cancer at our center between September 2005 and September 2013. 17 males and 13 females were treated. The median age at the time of reirradiation was 67 years (range 44 to 88 years). Median follow-up was 11 months (4 to 24 months).The median target volume was 41.29cc. The median prescription dose was 25Gy (24-36 Gy) in a median of 5 fractions prescribed to a mean 78% isodose line. The median overall survival was 14 months. The 1 and 2 year local control was 78%. The worst toxicity included 3/30(10%) grade III acute toxicity for pain, bleeding and vomiting. There was 2/30 (7%) Grade III long-term bowel obstructions. Conclusions: Management of locally recurrent pancreatic cancer, particularly after prior radiation therapy, is challenging. We report the utility of SBRT for reirradiation of locally recurrent pancreas cancer after prior radiation, with reasonable local control, modest survival and acceptable toxicity. Future prospective studies are needed to define the role of SBRT reirradiation for local recurrences in the setting of systemic therapy.
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