131 I, the radioactive iodide is rapidly accumulate the thyroid. Administered phosphate tends to accumulate in those tissues where cells have a rapid rate of proliferation, including neoplastic cell and normal cells of the bone marrow and lymphatic tissue. P has been used primarily for treatment of polycythemia vera, chronic myelocytic leukemia, and chronic lymphocytic leukemia.
P can itself result in neoplasm of the bone marrow.