Objective: To determine the frequency of expression of positive diagnostic marker alpha methylacyl-COA RACEMES (AMACR) in the examination of prostate needle biopsy specimens from patients of adenocarcinoma prostate from a subset of Pakistani population.
Study design: Cross-sectional study.
Place and Duration of Study: Department of Histopathology, Armed Forces Institute of Pathology, Rawalpindi from Apr 2015 to Oct 2015.
Material and Methods: All specimens of adenocarcinoma prostate diagnosed at Armed forces institute of pathology on the basis of immunohistochemistry and routine histopathology irrespective of age of patient, histological type or grade of the tumor were analyzed. Mean and Standard deviation were calculated for quantitative variables like patient’s age and frequencies along with percentages were calculated for qualitative variables like AMACR expression.
Results: Out of the total 80 cases, 68 (85%) were positive for AMACR while 12 (15%) were negative. Among the cases that were negative 9 (11.3%) showed 1 ± staining (Weak, non-circumferential) and 3 cases (3.8%) displayed 0 staining (No cytoplasmic staining).
Conclusion: Positive staining for AMACR can be used to support a diagnosis of cancer on prostate needle core biopsies when the focus in question is <1mm in maximum dimension. The results of AMACR expression in a subset of Pakistani population are comparable to the western studies. AMACR staining must be interpreted in the context of basic haematoxylin and eosin criteria for malignancy along with the results expansion of other supportive markers, such as a basal cell specific marker like p63 or 34βE12.
Keywords : Alphamethylacyl-CoA racemase (AMACR), Adenocarcinoma prostate, Immunohistochemistry.