title: Multicenter prospective study of magnetic resonance imaging prior to breast-conserving surgery for breast cancer.
abstract: BACKGROUND
  This multicenter prospective study aimed to assess the utility of dynamic enhanced magnetic resonance imaging (MRI) prior to breast-conserving surgery for breast cancer.
  
  
  METHODS
  The research subjects were drawn from patients with primary early resectable breast cancer treated in the breast disease centers of six three-level hospitals in Beijing from 1 January 2010 to 31 December 2012. The participants were allocated to a breast-conserving surgery group (breast-conserving group) or a total mastectomy group (total mastectomy group). Enhanced MRI was used to measure breast volume, longest diameter of tumor and tumor volume. The correlations between these measurements and those derived from histopathologic findings were assessed. The relationships between the success rate of breast-conserving surgery and MRI- and pathology-based measurement results were statistically analyzed in the breast-conserving group.
  
  
  RESULTS
  The study included 461 cases in the total mastectomy group and 195 in the breast-conserving group. Allocation to these groups was based on clinical indications and patient preferences. The cut-off for concurrence between MRI- and pathology-based measurements of the longest diameter of tumor was set at 0.3 cm. In the total mastectomy group, the confidence interval for 95% concurrence of these measurements was 35.41%-44.63%. Correlation coefficients for MRI and histopathology-based measurements of breast volume, tumor volume and tumor volume/breast volume ratio were r = 0.861, 0.569, and 0.600, respectively (all P < 0.001). In the breast-conserving group, with 0.30 cm taken as the cut-off for concurrence, the 95% confidence interval for MRI and pathology-based measurements of the longest diameter of tumor was 29.98%-44.01%. The subjective and objective success rates for breast-conserving surgery were 100% and 88.54%, respectively.
  
  
  CONCLUSIONS
  There were significant correlations between dynamic enhanced MRI- and histopathology-based measurements of the longest diameter of breast lesions, breast and tumor volumes, and breast volume/tumor volume ratios. Preoperative MRI examination improves the success rate of breast-conserving surgery.
authors.affiliation: Department of General Surgery, Breast Disease Center, Peking University First Hospital, Beijing 100034, China.
authors.forename: Qian
authors.initials: Q
authors.lastname: Liu
authors.affiliation: Department of General Surgery, Breast Disease Center, Peking University First Hospital, Beijing 100034, China. Email: liuyinhua@medmail.com.cn.
authors.forename: Yinhua
authors.initials: Y
authors.lastname: Liu
authors.affiliation: Department of Oncology, Breast Disease Center, Peking University First Hospital, Beijing 100034, China.
authors.forename: Ling
authors.initials: L
authors.lastname: Xu
authors.affiliation: Department of General Surgery, Breast Disease Center, Peking University First Hospital, Beijing 100034, China.
authors.forename: Xuening
authors.initials: X
authors.lastname: Duan
authors.affiliation: Department of Pathology, Breast Disease Center, Peking University First Hospital, Beijing 100034, China.
authors.forename: Ting
authors.initials: T
authors.lastname: Li
authors.affiliation: Department of Radiology, Breast Disease Center, Peking University First Hospital, Beijing 100034, China.
authors.forename: Naishan
authors.initials: N
authors.lastname: Qin
authors.affiliation: Department of General Surgery, Breast Disease Center, Xuanwu Hospital Capital Medical University, Beijing 100053, China.
authors.forename: Hua
authors.initials: H
authors.lastname: Kang
authors.affiliation: Department of General Surgery, Breast Disease Center, Beijing Chao-Yang Hospital, Beijing 100020, China.
authors.forename: Hongchuan
authors.initials: H
authors.lastname: Jiang
authors.affiliation: Department of General Surgery, Breast Disease Center, Peking University People's Hospital, Beijing 100044, China.
authors.forename: Deqi
authors.initials: D
authors.lastname: Yang
authors.affiliation: Department of General Surgery, Breast Disease Center, Beijing Friendship Hospital, Capital Medical University, Beijing 100050, China.
authors.forename: Xiang
authors.initials: X
authors.lastname: Qu
authors.affiliation: Department of Oncology, Breast Disease Center, 307 Hospital of People's Liberation Army, Beijing 100071, China.
authors.forename: Zefei
authors.initials: Z
authors.lastname: Jiang
authors.affiliation: Department of General Surgery, Breast Disease Center, 307 Hospital of People's Liberation Army, Beijing 100071, China.
authors.forename: Chengze
authors.initials: C
authors.lastname: Yu
mesh_terms: D000328:Adult; D001943:Breast Neoplasms / Q000601:surgery*; D005260:Female; D006801:Humans; D008279:Magnetic Resonance Imaging / Q000379:methods*; D008875:Middle Aged; D011446:Prospective Studies