PD-0019ORGAN PRESERVATION USING CONTACT RADIOTHERAPY FOR EARLY RECTAL CANCER: OUTCOMES OF PATIENTS TREATED AT A SINGLE CENTRE IN THE UNITED KINGDOM

Methods: The contact radiotherapy service for early rectal cancer at the Queen’s Centre for Oncology, Hull, United Kingdom commenced in September 2011. Patients were initially discussed at a multi-disciplinary meeting and were worked up with initial biopsy, MRI of liver and pelvis, CT Chest and endorectal US. Indications for contact radiotherapy are shown in table 1. All patients were treated using the Arianne Papillon50 machine. Patients treated following a local transanal excision were offered 60Gy in 2 fractions +/external beam chemo/radiotherapy to the pelvis to treat potential mesorectal nodes. Patients treated with primary radiotherapy were offered 90Gy in 3 fractions +/external beam chemo/radiotherapy to the pelvis. Pelvic radiotherapy volumes conformed to that described in the ARISTOTLE trial protocol. Follow up consisted of 3 monthly flexible sigmoidoscopy and 6 monthly MRI liver/ pelvis and CT Chest. Median follow-up was 12 months (range 1-29 months).