CD44 and neoplasm: Tumor cells from PC-3M-luc (11–15/ hpf) and PC-3M-luc-scr (15–19/ hpf) xenografts with DTX-treatment showed fewer apoptotic cells while tumors from PC-3M-luc-CD44-KD (17–21/ hpf) and PC-3M-luc-CD147-KD (12–18/ hpf) xenografts with VC-treated groups showed few apoptotic cells; almost no apoptotic cells were found in PC-3M-luc and PC-3M-luc-scr xenografts for VC-treated mice (Fig.5C and D,Table3).