Data Collection
Patients were stratified into three groups according to WHO guidelines; Group 1 (normal weight, <25 kg/m2), Group 2 (overweight, 25.0–29.9 kg/m2) and Group 3 (obese, ≥30 kg/m2) 15. Data items included demographic characteristics such as age, gender, presence of diabetes, coronary artery disease, hypertension, ASA score, ECOG performance status score, operative data including surgical approach, type of diversion and lymph node dissection were recorded and analyzed. The complications were classified according to the modified Clavien system and were retrospectively analyzed 16. Pathological specimens were evaluated at each institution’s pathology department using Tumor Node Metastasis classification for staging and the 2004 World Health Organization classification for grading. Ethics committee approval for the study was obtained from the ethics committee of the University of Çukurova (approval number- September 4,2019;91/60).