Keyhole-limpet haemacyanin and immune ribonucleic acid immunotherapy of murine transitional cell carcinoma.

Transitional cell carcinoma is known to be an immunogenic tumour. This immunogenicity has been the basis of a search for effective immunotherapeutic agents and for the evaluation in this study of two additional agents, keyhole-limpet haemacyanin (KLH) and immune ribonucleic acid (RNA) extract. The results in this animal model showed KLH to be a potent non-specific stimulant of the immune response which caused both a reduction in tumour growth and a prolongation of animal survival (p = 0.01). No anti-tumour effects were observed with either local or systemic RNA.