Use of Arsenic trioxide in APL treatment

Arsenic trioxide is a trivalent oxide of arsenic, with the chemical formula As2O3, also known as arsenite oxide, commonly known as arsenic, white arsenic, etc. Arsenic trioxide is a odorless and tasteless white powder, which is highly toxic. It has three forms: monoclinic, cubic, and amorphous, with slightly different melting and boiling points depending on the crystal form.