KLK3 and neoplasm: In conjunction with ADT, novel therapeutics targeting CSCs, e.g. Nkx3.1+, CD166hi, TROP2hiCD49fhiCD166hi, TRA-1-60/CD151/CD166, PSA−/lo, Nanog, Bmi-1 cells, might be developed to eradicate remaining refractory tumor cells and to prevent recurrence of CRPC.