title: Primary carcinoid tumor of the prostate with concurrent adenocarcinoma: a case report.
abstract: Prostatic adenocarcinomas commonly exhibit neuroendocrine differentiation as demonstrated by immunohistochemistry. However, true carcinoids of the prostate are rare. We describe herein a case of a primary carcinoid occurring synchronously with a conventional adenocarcinoma in the prostate of a 66-year-old man. The carcinoid measured 0.2 x 0.2 cm and did not show contiguity with adjacent conventional, moderately differentiated adenocarcinoma. Immunohistochemical stains for chromogranin and neuron-specific enolase were strongly immunoreactive in the carcinoid but not in the adenocarcinoma. Both neoplasms demonstrated positive staining for prostatic acid phosphatase and prostate-specific antigen. Owing to the relatively minute size of the carcinoid, the possibility that this tumor will impact negatively on the patient's overall prognosis is not anticipated.
authors.affiliation: Department of Oral and Maxillofacial Pathology, New York Hospital of Queens, New York, USA.
authors.forename: Julien E
authors.initials: JE
authors.lastname: Ghannoum
authors.forename: Ronald A
authors.initials: RA
authors.lastname: DeLellis
authors.forename: Sandra J
authors.initials: SJ
authors.lastname: Shin
mesh_terms: D000135:Acid Phosphatase; D000230:Adenocarcinoma / Q000737:chemistry / Q000473:pathology* / Q000601:surgery; D000368:Aged; D014408:Biomarkers, Tumor / Q000032:analysis; D002276:Carcinoid Tumor / Q000737:chemistry / Q000473:pathology* / Q000601:surgery; D053379:Chromogranin A; D002864:Chromogranins / Q000032:analysis; D018572:Disease-Free Survival; D006801:Humans; D007124:Immunoenzyme Techniques; D008297:Male; D009378:Neoplasms, Multiple Primary / Q000737:chemistry / Q000473:pathology* / Q000601:surgery; D010751:Phosphopyruvate Hydratase / Q000032:analysis; D017430:Prostate-Specific Antigen / Q000032:analysis; D011471:Prostatic Neoplasms / Q000737:chemistry / Q000473:pathology* / Q000601:surgery; D017027:Protein Tyrosine Phosphatases / Q000032:analysis
chemical_list: D014408:Biomarkers, Tumor; D053379:Chromogranin A; D002864:Chromogranins; D000135:Acid Phosphatase; C428439:prostatic acid phosphatase; D017027:Protein Tyrosine Phosphatases; D017430:Prostate-Specific Antigen; D010751:Phosphopyruvate Hydratase