The objective of the present study was to validate prognostic gene signature for
estrogen receptor alpha-positive (ER03B1+) and lymph node (+)
breast cancer for improved selection of patients for adjuvant
therapy. In our previous study, we identified a group of seven genes (GATA3, NTN4, SLC7A8, ENPP1, MLPH, LAMB2, and PLAT) that show elevated
messenger RNA (
mRNA) expression levels in ERα (+)
breast cancer patient samples. The prognostic values of these genes were evaluated using gene expression data from three public data sets of
breast cancer patients (n = 395). Analysis of ERα (+)
breast cancer cohort (n = 195) showed high expression of GATA3, NTN4, and MLPH genes significantly associated with longer relapse-free survival (RFS). Next cohort of ERα (+) and node (+) samples (n = 109) revealed high
mRNA expression of GATA3, SLC7A8, and MLPH significantly associated with longer RFS. Multivariate analysis of combined three-gene signature for ERα (+) cohort, and ERα (+) and node (+) cohorts showed better hazard ratio than individual genes. The validated three-gene signature sets for ERα (+) cohort, and ERα (+) and node (+) cohort may have potential clinical utility since they demonstrated predictive and prognostic ability in three independent public data sets.