Background. Many investigators point out the importance of detecting the neuroendocrine differentiation of prostate adenocarcinoma (PA) and consider its relationship to the clinical picture of the disease and total Gleason scores (Gleason index).
Objective: to study relations between the presence of markers indicative of neuroendocrine differentiation in PA tissue, Gleason index, and disease characteristics.
Materials and methods. The fragments of the postoperative histological specimens obtained from 30 patients after radical prostatectomy in 2008 were stained by an immunohistochemical assay to identify specific markers of neuroendocrine differentiation: chromogranin A (CgA) and synaptophysin. The expression of the markers of neuroendocrine differentiation was compared to the clinical stage of the disease and Gleason index that was used to allocate the patients to 3 groups: low-, moderate-, and high-grade tumors.
Results. The patients» mean age was 67 ± 9.2 years. Groups 1, 2, and 3 included 5, 19, and 6 patients, respectively. The expression of CgA was found in 10 % of Group 1 patients, in 33 % in Group 2, and in 40% in Group 3. CgA expression considerably increased with a higher Gleason score (p = 0.024).
Conclusion. The expression of CgA is more than that of other used markers and correlates with the clinically determined stage of the disease. The expression of CgA increases with a higher grade, which can be potentially used to predict the course of the disease. The limitations of this investigation are associated with its retrospective pattern and a small sample size. The findings need to be clarified in a large cohort study.