"ASK OUR RN (at www.cancerpage.com) QUESTION: Is Acute Promyelocytic Leukemia the same as AML M3? I know for APL, ATRA is used. Is APL is a subtype of AML M3 or they are the same thing. ANSWER: Hello, yes APL is the same thing as AML M3. M3 is part of the FAB (French American British) classification system. ATRA is all trans retinoic acid and has been used with a great deal of success in treating patients who have APL. Good luck. ONC RN" Thanks to www.cancerpage.com for the above information. For more information about the different classifications of Leukemia, visit the cancerpage.com Remember we are NOT Doctors and have NO medical training. This site is like an Encylopedia - there are many pages, many links on many topics. Support our work with any size DONATION - see left side of any page - for how to donate. You can help raise awareness of CAM.