Differential expression of RAD54-like in triple negative breast cancer.
Women diagnosed with triple negative breast cancer can benefit neither from endocrine therapy nor from HER2-targeted therapies (1). We mined published microarray datasets (2, 3) to determine in an unbiased fashion and at the systems level genes most differentially expressed in the primary tumors of patients with breast cancer. We report here significant differential expression of the gene encoding RAD54-like, RAD54L, when comparing the tumor cells of patients with triple negative breast cancer to normal mammary ductal cells (2). RAD54L was also differentially expressed in bulk tumor in human breast cancer (3). RAD54L mRNA was present at significantly increased quantities in TNBC tumor cells relative to normal mammary ductal cells. Analysis of human survival data revealed that expression of RAD54L in primary tumors of the breast was correlated with overall survival in patients with basal-like and normal-like subtype cancer, while within triple negative breast cancer, primary tumor expression of RAD54L was correlated with overall survival in patients with basal-like 1 subtype disease. RAD54L may be of relevance to initiation, maintenance or progression of triple negative breast cancers.