Transitional cell carcinoma of the prostate following intravesical therapy for transitional cell carcinoma of the bladder.

From 1983 to 1986, 63 male patients received various regimens of intravesical therapy for superficial transitional cell carcinoma of the bladder. Of these 63 patients 10 were subsequently diagnosed as having transitional cell carcinoma of the prostate. Five of the 10 patients had no tumor remaining in the bladder at diagnosis of transitional cell carcinoma of the prostate. In 3 patients tumor in the prostate was more invasive than tumor in the bladder. In 2 patients tumor involvement was greater in the bladder than in the prostate. Patients undergoing treatment with intravesical therapy for transitional cell carcinoma of the bladder, especially those receiving multiple courses for prolonged periods, should be monitored closely for the development of transitional cell carcinoma of the prostate.