CD133 expression was next analysed by qRT-PCR in SC (α2β1hi/CD133+), TA (α2β1hi/CD133-) and CB (α2β1low/CD133-) cell populations isolated from low passage (<10) primary prostate epithelial cultures (1 BPH and 2 CaP) (Figure 5A). The gene discussed is PROM1; the disease is benign prostatic hyperplasia.