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Immunological reactivity to hepatoma 22a was studied in newborn and adult mice pretreated with tumour antigens. Treatment of newborn mice enhanced the growth rate of hepatoma 22a. Analogous treatment of adult mice resulted in the immunization effect. Evidently this difference was connected with a possible change of immunological reactivity to the tumour in newborn mice. This is supported by the results of cell dynamics--a mediated immunity assessed by the macrophage migration inhibition test. Splenic cells of the pretreated adult mice possessed the capacity to depress the macrophage migration more intensively in comparison with those of the pretreated newborn mice.

As a result of the complex immunobiological study in an autologous system on the models of DMBA induced tumors in muscular tissue there were shown 3 types of cell response to primary tumors, their metastases and autotransplantation: no response, moderate and very pronounced reaction. In a definite percentage of cases autologous peritoneal macrophages were found to inhibit malignant cells in autotransplantation. The percentage of positive inoculations and an average weight of transplants of primary tumors and their metastases at the moment of highest transplantation immunity (12-14 days) have been definitely correlated with the intensity of cell response developed in these tissue, and also are dependent on individual features of proper malignant cells.