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Adenoid cystic/basal cell carcinoma of the prostate: review and update
Maria Dirlei Begnami1, Martha Quezado, Peter Pinto
1Laboratory of Pathology, National Cancer Institute, National Institutes of Health, Bldg 10/Room 2N216, 9000 Rockville Pike, Bethesda, MD 20892, USA. begnamim@mail.nih.gov
Context:
Although most prostate carcinomas are of the conventional acinar type, unusual variants have been reported. Adenoid cystic/basal cell carcinoma of the prostate is a rare tumor with distinctive histopathologic features. There are only a few publications in the literature concerning the diagnosis, treatment, and prognosis of this neoplasm.
Objective:
To review current literature together with the clinical, pathologic, and immunohistochemical features of adenoid cystic/basal cell carcinoma of the prostate and offer a practical approach to the diagnosis--including the differential diagnosis--of this neoplasm in surgical pathologic specimens.
Data Sources:
Adenoid cystic/basal cell carcinoma of the prostate is composed of infiltrating basaloid cells forming dilated acinar and cribriform spaces with luminal basementlike material. Differentiation of adenoid cystic/basal cell carcinoma from basal cell hyperplasia and cribriform pattern of acinar adenocarcinoma may be difficult. The use of cytokeratin 34betaE12 and prostate-specific antigen can help in difficult cases. Most cases are indolent, but metastasis has been documented in a few cases.
Conclusions:
Various histologic and immunohistochemical features are helpful in recognizing adenoid cystic/basal cell carcinoma of the prostate. This is a rare subtype of prostate cancer and correct diagnosis is important because of the unique clinical and biological features and the implications for treatment and prognosis.
