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Neuro-endocrine cells--a new prognostic parameter in prostate cancer.

Neuro-endocrine cells are a recognised component of prostatic ducts and acini. Half of all clinically manifest cancers show neuro-endocrine differentiation. Occult carcinomas have a lower incidence of such differentiation. Neuro-endocrine cells are of major prognostic importance and appear more reliable in predicting patients' survival than do conventional histological grading systems.