CD44 and cancer: 19 Najafzadeh Najafzadeh N N Mazani Mazani M M Abbasi Abbasi A A Farassati Farassati F F Amani Amani M M Low-dose all-trans retinoic acid enhances cytotoxicity of cisplatin and 5-fluorouracil on CD44(+) cancer stem cells Low-dose all-trans retinoic acid enhances cytotoxicity of cisplatin and 5-fluorouracil on CD44(+) cancer stem cells Biomed Pharmacother Biomed Pharmacother 2015 2015 74 74 243 243 251 251 26349992 26349992