Effect of Stereotactic Body Radiation Therapy Combined with Thermoplastic Fixation on Set-Up Errors in Breast Cancer Patients Undergoing Radiotherapy

Abstract

Objective. To investigate the effect of stereotactic radiotherapy (SBRT) combined with thermoplastic fixation on set-up error in breast cancer (BC) patients undergoing radiotherapy. Methods. Ninety BC patients undergoing radiotherapy who were treated in our hospital (May 2019-May 2020) were selected as the research objects and equally divided into the experimental group and control group according to the order of hospitalization, with 45 patients in each group. The control group received conventional radiotherapy combined with breast bracket, and the experimental group received SBRT combined with thermoplastic fixation. The incidences of adverse reactions, 1-year survival rates, and set-up errors were compared between the two groups. Results. Compared with the control group, the experimental group had much lower total incidence of adverse reactions and remarkably higher 1-year survival rate. The translational errors ( $X$ direction, $Y$ direction, and $Z$ direction), translational errors after rotation ( $X$ direction, $Y$ direction, and $Z$ direction), and rotation errors ( $X$ direction, $Y$ direction, and $Z$ direction) in the experimental group were obviously lower compared with those in the control group. Conclusion. Implementing SBRT combined with thermoplastic fixation in BC patients undergoing radiotherapy can effectively improve set-up efficiency and treatment accuracy and reduce set-up errors. Compared with the breast bracket, the combination of SBRT and thermoplastic fixation has higher application value, and further studies are conducive to providing patients with a better solution plan.