Abstract P1-01-12: Preoperative breast MRI does not affect survival outcomes in T1-2 breast cancer patients who underwent breast-conserving therapy

Abstract

Abstract Purpose: The aim of the study is to evaluate the efficacy of preoperative breast MRI in T1-2 women with breast cancer. Methods: Total 1179 patients, who had T1-2 breast cancer and underwent definitive surgery between 2007 and 2010, were reviewed in this study. Preoperative breast MRI was performed in 981 women with breast cancer. We divided patients into two groups: Patients underwent preoperative MRI and breast-conserving therapy (BCT), those who did not undergo preoperative MRI but BCT. Patients underwent preoperative MRI and total mastectomy were excluded. Clinicopathological features were analyzed using Chi-square or Fisher’s exact test if indicated. Survival analyses were examined using Kaplan-Meier method and log-rank test. Cox-proportional hazard model was accessed as multivariate analysis. Results: In 873 patients who underwent BCT, 675 patients (77.3%) received preoperative MRI, and 198 (22.7%) patients did not. Clinicopathological features including T-stage, Nodal status, histologic type, progesterone receptor, histologic grade, age group (≤ 35 vs. > 35 yr), adjuvant chemotherapy, radiation, and hormone therapy were not significantly different between two groups. Patients aged 50 or younger received more preoperative MRI than those over aged 50 years (42.8 % vs. 51.5%, p=0.02). Estrogen receptor positive-tumors were more common in patients with preoperative MRI (74.9% vs. 67.2%, p=0.03). HER2 over-expression was frequently found in women without preoperative MRI (7.9% vs. 14.6%, p<0.001). In univariate analyses, there was no significant difference in recurrence-free and overall survival between patients who underwent breast MRI and those who did not (p for RFS = 0.75, p for OS = 0.48). In multivariate analyses, preoperative MRI did not influence on RFS and OS (HR for RFS = 0.82, 95%CI= 0.35-1.91, HR for OS = 1.52, 95% CI= 0.40-5.76). Age group and HER2 were not associated with RFS and OS (all p>0.05). ER was an independent prognostic factor for RFS and OS (all p<0.01). Conclusions: Routine use of preoperative MRI in women with T1-2 breast cancer may not translate into better RFS and OS. Citation Format: Jegyu Ryu, Sanghwa Kim, Jee Ye Kim, Hyung Seok Park, Seho Park, Seung il Kim. Preoperative breast MRI does not affect survival outcomes in T1-2 breast cancer patients who underwent breast-conserving therapy [abstract]. In: Proceedings of the Thirty-Seventh Annual CTRC-AACR San Antonio Breast Cancer Symposium: 2014 Dec 9-13; San Antonio, TX. Philadelphia (PA): AACR; Cancer Res 2015;75(9 Suppl):Abstract nr P1-01-12.