ESTRO 2022 - Abstract Book

S1091

Abstract book

ESTRO 2022

by including patients with a middle third oesophageal tumour. The data from this study can be used to justify the use of 4D-CTs for middle-third oesophageal patients.

PO-1294 clinical prognostic factors for esophageal cancer treated with definitive chemo-radiotherapy

S. Favareto 1 , C. Sousa 1 , P. Pinto 1 , H. Ramos 1 , E. Neto 1 , C. Abrahao 1 , M. Chen 1 , A.C. Pellizzon 1 , M.L. Silva 1 , G. Gondim 1 , D. Castro 1 , R. Fogaroli 1

1 AC Camargo Cancer Center, Radiation Oncology, São Paulo, Brazil

Purpose or Objective Evaluate clinical prognostic factors for progression-free survival (PFS) and overall survival (OS) in patients with esophageal cancer treated with definitive radiotherapy (RT) and chemotherapy (CT). Materials and Methods Clinical records of 60 patients treated from April 2011 until December 2019 with esophageal cancer considered unresectable and/or without clinical conditions for surgery, treated with definitive CRT were analyzed. All patients had upper digestive endoscopy (UDE) with positive biopsy, neck, chest and abdominal CT-scan (CT) and 18F-fluorodeoxyglucose positron- emission tomography (PET-CT). Patients were followed with physical examination, and CTs every three months in the first and second year and every 6 months from the third year of follow-up. UDE was made every three to six months after the end of the treatment or in suspicion of tumor recurrence. PET-TC was also performed in the follow-up when clinically necessary. Local and regional failure (LRF) were defined as abnormalities in the image tests within the PTV (planning target volume) and/or positive biopsy on UDE. Any other failure was defined as a distant failure (DF). PFS was defined in the record of the first tumor recurrence site and OS in the death record from the date of the start of treatment. Results The median age of the patients was 66 years (range: 33 to 83 years) and 46 patients (76,7%) were male. Squamous cell carcinoma (SCC) was the most frequent histological type (85%). Most patients had tumors located in the mid-thoracic esophagus (53,3%) and stage III or IV (59,9%). All patients were treated using 3D (76,7%) or IMRT (23,3%). The median total dose was 50,4Gy. All patients received platinum-based CT concomitant with RT. The most common regimen used was carboplatin and paclitaxel, with a median of 5 cycles. With a median follow-up of 19 months the median PFS and OS (figure 1) was respectively 10 and 20 months. LRF and DF as the first site of failure were observed respectively in 22 (36,6%) and 26 (43,3%) patients. In the univariate analysis, tumor length lower than 2.6 cm, GTV volume lower than 28 cm 3 , clinical tumor stage T1 and T2, clinical node stage N0, clinical prognostic stage groups I and II and complete response to treatment, were statistically significant factors for the better PFS and OS. In the multivariate analysis, the presence of node clinical N0 was related to the better PFS (p=0.02) (figure 2).