A mouse model for immunotherapy of osteosarcoma

Effectiveness of peanut agglutinin-binding glyco-related antigen and cyclophosphamide on metastasis of Lewis lung carcinoma

Soluble tumor-associated antigens were isolated from Lewis lung carcinoma (3LL) cells by detergent solubilization and purified by affinity chromatography on peanut agglutinin (PNA)-agarose. Subcutaneous injection of PNA-binding glyco-related antigen into 3LL-bearing male C57BL/6 mice significantly augmented delayed-type hypersensitivity (DTH), and also inhibited the growth of the primary 3LL tumors. The effects of combined immunotherapy and chemotherapy with this antigen and cyclophosphamide (CY) were examined following excision of 3LL by determining the number of pulmonary surface nodules and wet weight of the lungs. Injection of PNA-binding glyco-related antigen and CY significantly inhibited pulmonary metastasis and prolonged the survival of the mice. The spleen cells obtained from mice with combined treatment showed higher neutralizing activity against 3LL cells than other groups. Therefore, combined immuno and chemotherapy may be useful in preventing metastasis.

Mononuclear phagocytes in the control of primary and secondary tumor growth

In a variety of defined experimental host/tumor situations there is now considerable evidence that mononuclear phagocytes are critically involved in the control of tumor cell nidation and their establishment as primary tumors. The factors which determine secondary tumor cell spread and the establishment of metastases are clearly complex and make it highly unlikely that tumor cell dissemination is under the control of a single host defense mechanism. Nonetheless, findings in various experimental models suggest a critical role for mononuclear phagocytes in the surveillance of tumor cell dissemination.