Androgen-deprivation therapy in the management of neuroendocrine prostate cancer.

Background: Prostatic neuroendocrine carcinomas comprise <1% of all prostate neoplasms, and approximately 200 cases have been reported in the literature. We undertook this study to describe the experience in the management of prostatic neuroendocrine carcinoma with androgen-deprivation therapy (ADT).

Methods: We designed a retrospective, descriptive and observational study. In patients with suspicion of prostate cancer, transrectal ultrasonography-guided biopsy (TRUS) or transurethral resection of prostate (TURP) was carried out during the period from January 2000 to December 2007. Patients were selected by anatomopathological diagnostic study of neuroendocrine carcinoma including pure and mixed variants. Characteristics analyzed were age, clinical stage, prostate-specific antigen (PSA), imaging studies, treatment and survival.

Results: Ten cases were included with a median age of 66.5 years. Symptoms at diagnosis were associated with metastasis to other organs, one with bone metastasis, and presenting pain in 100% of the cases. A suspicious rectal digital examination was detected in 100% of the patients. In three (30%) patients, PSA was suspicious for prostate cancer. The extension studies showed bone, locoregional, lung and hepatic metastases. In six (60%) patients mixed variant was documented (acinar adenocarcinoma and neuroendocrine carcinoma) with a median survival of 11.6 months. In four patients (40%), pure neuroendocrine carcinoma was documented with a median survival of 7 months.

Conclusions: Prostatic neuroendocrine carcinoma is uncommon, aggressive and represents a prostatic neoplasia without PSA expression. In advanced disease, very low response is reached with ADT.