Lung Neoplasms/prevention & control; Polyamines; Prostatic Neoplasms/therapy; Animals; Cell Division/drug effects; Cyclophosphamide/therapeutic use; Cytotoxicity, Immunologic/drug effects; Diet; Dose-Response Relationship, Drug; Hydrolases/metabolism; Kidney/drug effects; Kidney/metabolism; Killer Cells, Natural/drug effects; Killer Cells, Natural/immunology; Liver/drug effects; Liver/metabolism; Lung Neoplasms/drug therapy; Lung Neoplasms/pathology; Lung Neoplasms/secondary; Male; Mice; Mice, Inbred C57BL; Mice, Inbred DBA; Polyamines/metabolism; Prostatic Neoplasms/drug therapy; Prostatic Neoplasms/metabolism; Prostatic Neoplasms/pathology; Rats; Rats, Inbred Strains; Spleen/drug effects; Spleen/metabolism