 For relapsed acute promyelocytic leukemia ( APL ) , arsenic trioxide is approved by the US FDA . Like ATRA , arsenic trioxide does not work with other subtypes of AML . 
 For relapsed acute promyelocytic leukemia ( APL ) , arsenic trioxide is approved by the US FDA . Like ATRA , arsenic trioxide <a href='uninflect' title='1'><mark>does</mark></a> not work with other subtypes of AML . 
For relapsed acute promyelocytic leukemia ( APL ) , arsenic trioxide is approved by the US FDA . Like ATRA , arsenic trioxide do not work witt other subtypes of AML .