Transitional cell carcinoma of the prostate.

5 cases of transitional cell carcinoma of the prostate, which represent 1.5% of a series of 323 consecutive prostatic carcinomas, are presented. The cases with possible prostatic involvement by contiguity from a bladder carcinoma as well as those tumors with a transitional pattern which contain prostatic acid phosphatase in the cellular cytoplasm have been ruled out to make the diagnosis. The mean age of the tumoral onset is 70 years with an identical symptomatology to that of the adenocarcinoma. In 20% of the cases it is associated with an adenocarcinoma and in 40% with a bladder carcinoma without contiguity. The mean survival is 10.6 months with 60% succumbing within the first 6 months. Our findings agree with all authors in considering this type of tumor an urothelial neoplasia.