The invention relates to the use of arsenic compounds to treat a variety
of neoplastic diseases. The present invention encompasses the
administration to a mammal of arsenic in the form of a salt, complex,
organic compound or ionic solution to treat tumors of epithelial tissue,
connective tissue, central nervous system, lymphoid tissue, hematopoietic
cells and tumors associated with oncogenic viruses. This invention also
encompasses the treatment of hematopoietic disorders in mammals by the
administration of one or more arsenic compounds to said mammal. Further,
the arsenic compounds may be used to treat metastatic neoplastic
diseases.