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In a transplanted lymphosarcoma of rats by means of Cosinor method we discovered rhythm of P32 inclusions with ultradian and circadian periods. In the course of tumor growth changes of spectrum of periods, amplitudes and acrophases of rhythms take place. These shifts are explained by the progression and clonal structure of neoplasms.
A mismatch between a circadian rhythm of blood-methotrexate level and that of the drug concentration in rat transplanted lymphosarcoma tissue was established. The drug proved 3 times more effective when given at the time of the day when its concentration in tumor tissue was likely to be the highest.