Compounds and methods for the treatment of cancer

The present invention relates generally to the field of anti-cancer therapy. More particularly, it provides novel crystalline forms of organic arsenic compounds and methods for their use in treating cancers such as leukemia and solid tumors. Specifically, a crystalline form of darinaparsin, wherein the crystalline form has a melting point in the range of about 190-200 deg C. 本发明总体上涉及抗癌治疗领域。更具体地说，在此提供了有机砷化合物的新颖的结晶形式以及在治疗癌症如白血病以及实体肿瘤中使用它们的方法。确切地说，种达雷纳帕辛的结晶形式，其中该结晶形式具有在约190℃-200℃的范围内的熔点。