Previous comparative microarray analysis of CD44+/CD24-/lineage- cancer cells and normal breast epithelial cells revealed specific increased expression of SLUG in the CD44+/CD24- subpopulation, although differences did not reach statistical significance due to small sample size (3 samples for non-CD44 and five samples for CD44+ tumor samples, p = 0.054) [13]. This evidence concerns the gene CD44 and cancer.