The Effect of Total Size of Lesions in Multifocal/Multicentric Breast Cancer on Survival

Clin Breast Cancer. 2018 Aug;18(4):320-327. doi: 10.1016/j.clbc.2017.11.002. Epub 2017 Nov 9.

Abstract

Background: In this study, we aimed to assess the prognostic performance of determining the T stage according to the total size of lesions compared with the size of the largest lesion in the breast in patients with multifocal/multicentric (MF/MC) breast cancer.

Patients and methods: The charts of the patients with MF/MC breast cancer who were diagnosed between 2003 and 2014 were reviewed. The T stage of MF/MC tumors was determined according to the largest lesion size (Tmax) as well as the sum of the longest diameters of the lesions (Tsum) in the breast.

Results: Multifocal/multicentric tumors were identified in 323 of 3890 patients (8.3%) with breast cancer. Ten-year rates of overall survival (OS; 75% and 74%; P = .965) and disease-free survival (DFS; 66% and 61%; P = .817) were similar in patients with unifocal and MF/MC tumors, respectively. When the T stage was determined by summing the sizes of the lesions, the T stage of 67 (20.7%) and 63 (19.5%) patients advanced from T1 to T2 and from T2 to T3, respectively. Thus, the T stage increased in 130 patients (40.2%) according to American Joint Committee on Cancer. Discriminatory ability of Tsum was better than Tmax in terms of OS and DFS, as shown with higher Royston D and Harrel C statistics and Schemper V values.

Conclusion: The new T classification proposed in this report stands out as a better predictive classification particularly in patients with low disease burden.

Keywords: Multicentricity; Multifocality; Staging; T classification; Unifocal.

Publication types

  • Comparative Study

MeSH terms

  • Breast Neoplasms / mortality*
  • Breast Neoplasms / pathology*
  • Breast Neoplasms / therapy
  • Disease-Free Survival
  • Female
  • Humans
  • Middle Aged
  • Neoplasm Staging
  • Prognosis
  • Retrospective Studies
  • Survival Rate
  • Tumor Burden*