1989 Volume 80 Issue 2 Pages 204-209
The effect of lymphokine-activated killer (LAK) cells on bladder tumor was examined in vivo and in vitro. In the in vitro experiment, 51Cr-cytotoxic assay was performed for which PBL were used as effector cells. A LAK activity of 26.6% was observed in PBL cultured with IL2 for 4 days, whereas OK-432-induced LAK activity was 22%.
Furthermore, in the in vivo experiment, the anti-tumor effect of LAK cells was evaluated in human bladder tumor transplanted into nude mouse. IL2, OK432-induced LAK cells were injected intratumorally. In the LAK-treated group, inhibition of tumor growth was seen. Histologically, it was demonstrated that infiltrating lymphocytes were scatterd around tumor cells. The augmentation of NK activity in spleen cells was observed in the LAK-treated group.
Although further studies are reguired to establish its full significance, these findings suggest that immunotherapy against bladder tumors is hopeful.
