Phase II study of CI-958 in patients with hormone refractory prostate carcinoma.

A phase II trial of CI-958 (NSC #635371), a new benzothiopyranoindazole was performed in patients with hormone refractory prostate carcinoma using prostate specific antigen (PSA) levels for response assessment. Twenty-two patients were entered on this study and twenty one were eligible. Toxicity consisted mainly of granulocytopenia (71% grade 3 or 4), but there were no significant infections. Two patients were removed from study due to asymptomatic decreases in cardiac ejection fraction. Of 21 evaluable patients, there were four responders (19%, CI 0-35%).