Studies used different human prostate cancer cell lines including PC-3 [26, 30–35], DU145 [28–31, 34, 36, 37], LNCaP [34, 35], CD44+/CD133+ HuPCaSCs [38], C4-2 [28], and 22RV1 [30, 37]. The gene discussed is CD44; the disease is Familial prostate cancer.