Differential expression of CKS2 in cancers of the breast.
Breast cancer affects women at relatively high frequency (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 the CDC28 protein kinase regulatory subunit 2, CKS2, when comparing primary tumors of the breast to the tissue of origin, the normal breast. CKS2 was also differentially expressed in the tumor cells of patients with triple negative breast cancer. CKS2 mRNA was present at significantly higher quantities in tumors of the breast as compared to normal breast tissue. Analysis of human survival data revealed that expression of CKS2 in primary tumors of the breast was correlated with overall survival in patients with basal and luminal A subtype cancer, but in a contrary manner. CKS2 may be of relevance to initiation, maintenance or progression of cancers of the female breast.