In the current report, we analyzed a list of 853 genes with ≥2-fold expression and p-value <0.05 that were differentially expressed in Epcam+CD44-CD49f+ fetal cells (FC) and adult TIC compared to Epcam+CD44+CD49fHi basal cells (BC) and Epcam+CD44-CD49fLo luminal cells (LC) to identify genes that may enable TIC to be identified in prostate tissue specimens (data not shown). Here, CD44 is linked to breast cancer.