Aldehyde dehydrogenase 1 expression predicts poor prognosis in triple-negative breast cancer

Authors


  • Y.O. and Y.U. contributed equally to this work.

A Tanimoto, MD, PhD, Department of Molecular and Cellular Pathology, Field of Oncology, Kagoshima University Graduate School of Medical and Dental Sciences, 8-35-1, Sakuragaoka, Kagoshima 890-8544, Japan. e-mail: akit09@m3.kufm.kagoshima-u.ac.jp

Abstract

Ohi Y, Umekita Y, Yoshioka T, Souda M, Rai Y, Sagara Y, Sagara Y, Sagara Y & Tanimoto A
(2011) Histopathology59, 776–780

Aldehyde dehydrogenase 1 expression predicts poor prognosis in triple-negative breast cancer

Aims:  Aldehyde dehydrogenase 1 (ALDH1) has been identified as a reliable marker of breast cancer stem cells, and its clinical significance as a prognostic indicator of breast cancer has been reported by several investigators. However, the clinical significance of ALDH1 expression in triple-negative (TN) breast cancer, a high-risk breast cancer lacking the benefit of specific therapy, remains to be solved.

Methods and results:  We performed immunohistochemical analyses of 106 TN breast cancers, using paraffin-embedded sections. The basal-like phenotype was also investigated with the use of basal cytokeratin 5/6 and epidermal growth factor receptor. ALDH1 expression in carcinoma cells was found in 59% of cases and was correlated with high histological grade alone (P < 0.006), whereas ALDH1 expression in stromal cells was found in 49% of cases but was not correlated with any clinicopathological parameter. Patients with ALDH1 expression in carcinoma cells had a shorter relapse-free survival (RFS) according to the log-rank test (P = 0.015). According to Cox multivariate analysis, ALDH1 expression in carcinoma cells was an independent prognostic indicator of RFS (P = 0.025). The log-rank test revealed that stromal expression of ALDH1 had no effect on RFS.

Conclusions:  ALDH1 expression in carcinoma cells is an independent prognostic factor in TN breast cancer patients.

Ancillary