Intravesical therapy with pertussis toxin before radical cystectomy in patients with bladder cancer: A Phase I study

Objectives. To ascertain the side effects of intravesical instillation of p ertussis toxin (PTX) because it inhibits tumor cell motility in vitro and i n vivo and seems to be a promising therapeutic approach against cancer. Methods. We initiated a Phase I study and measured the effect of intravesic al instillation of PTX before radical cystectomy. Study end points were PTX -related side effects. PTX was instilled at five dose levels, starting with 14 mu g and continuing to 72 mu g. Results. Fifteen patients, with a median age of 64 years, were included in the study. Intravesical instillation of PTX was without local or systemic s ide effects (grade 0, according to National Cancer Institute toxicity crite ria). Conclusions. Treatment with PTX was safe and well tolerated without any sig nificant local or systemic toxicity in dosages up to 72 mu g. Therefore, th e influence of PTX on local tumor should be evaluated in a Phase II study. (C) 1999, Elsevier Science Inc.