The influence of a new antitumor enzyme L-lysine alpha-oxidase on Lewis lung carcinoma spreading was studied in mice in which primary tumor had been removed. The enzyme was found to significantly decrease the extent and number of lung metastases as compared to mice which hadn't received L-lysine alpha-oxidase. This was matched by recovery of alveolar macrophages functional activity, as assessed by adenosine deaminase and 5' nucleotidase levels in these cells. Moreover, antimetastatic and cytostatic effect was confirmed by the measuring of polyamine concentration in mice erythrocytes.
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