An in vivo comparative study of 45Ca-uptake and lipid peroxidation in tissues of mice treated with ATP complex of iron and sodium salt of ATP shows that only the iron complex produces a sustained increase of intracellular calcium on the organs susceptibles to develop lymphomas. A paralled study of 59Fe-uptake from 59Fe-iron complex of ATP presents a coincidental increase of iron uptake in those organs. To prove the involvement of the calcium homeostasis change in lymphoma-induction we have studied it with the lanthanum complex of ATP. Lanthanum is a well known cellular calcium entry modifier. Based on the results, the increased and sustained entry of extracellular calcium ion appears as the cause of lymphoma-induction by the iron complex. The effects of the calcium-overload in proliferation and neoplastic transformation of lymphocytes, as well as in reducing the immuno-response induced by thymus is discussed.

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