West Asia Organization for Cancer Prevention (WAOCP), APOCP's West Asia Chapter. Asian Pacific Journal of Cancer Prevention 1513-7368 17 3 2016 03 01 Effects of Millimetric Shifts in Breast Cancer Radiotherapy on the Radiation Dose Distribution 1197 1199 32220 EN Yusuf Tolga Sanli Radiation Oncology,Hatay Public Hospital, Hatay, Turkey Funda Cukurcayir Fatma Abacigil Journal Article 1970 01 01 Background: This study aimed to facilitate decision-making in cases of breast cancer radiotherapy shifts by simulating millimetric shifts and analyzing their effects on dose distribution. Methods: The study included 30 patients with left side breast cancer who were treated with three dimensional conformal radiotherapy (3D-CRT) in the Radiation Oncology Department in Hatay Public Hospital, between January 2013 and April 2015. A treatment plan shifting at three axes with six different measures was simulated. Results: The biggest difference in values was (3mm shift) 476cGy, with a 7.7 % change for heart and 25.6% for spinal cord. The shifts in values respectively for CTV min, mean, max were -4.8%, 2.5%, 4%. The differences for lymphatic min, mean, max were 21.3%, 20.3%, -12.2%. Conclusion: The most important thing is not the treatment plan quality, but its practicality. The treatment plan must be practical and its practice must be controlled rigidly. https://journal.waocp.org/article_32220_2751c586893e2133183acd04b9925737.pdf