Effects of anti-intercellular adhesion molecule-1 and anti-lymphocyte-function-associated antigen-1 monoclonal antibodies on the metastasis of murine tumors.

Anti-intercellular adhesion molecule-1 (anti-ICAM-1) and anti-lymphocyte-function-associated antigen-1 (anti-LFA-1) monoclonal antibodies (mAbs) were injected into mice and their effects on tumor metastasis were investigated using two murine models. Depending on the dose, the anti-ICAM-1 mAb (KAT-1) expressed both inhibitory and promoting effects on liver metastases of ICAM-1 + LFA-1 + P815 mastocytoma cells, whereas it enhanced lung metastases of the ICAM-1-LFA-1-Meth-A fibrosarcoma cells at any doses. In contrast, anti-LFA-1 mAb (KBA) showed promoting effects only on the metastases of both tumor lines. Treatment of mice with either mAb enhanced metastases of P815 mastocytoma cells in the spleen.