The role of cyclin D1, BCL-2, p53 and Ki-67 in epithelial cells in the etiopathogenesis of pterygium.

CONTEXT: Pterygium is a degenerative disease that consists of conjunctival epithelia and fibrovascular tissue. Some studies suggest that there is a defect in the regulation of apoptosis in the epithelial cell cycle characterized by the development of the disease. But, still this matter being debated. AIMS: In this study, the clinical, histopathological data, and the expression of the cell cycle regulator Cyclin D1, anti-apoptotic BCL-2, tumor suppressor p53, and cell proliferation marker Ki-67 were searched in pterygium samples. SUBJECTS AND METHODS: The study enrolled 62 cases of primary pterygium who underwent excision between 2014 and 2017. Recurrent and pseudo-pterygium cases were excluded from series. The clinical data were obtained from the patient files and the slides were reevaluated for the histopathological data. Slides of all were stained by Cyclin D1, BCL-2, and Ki-67 by the immunohistochemical method. For each immunohistochemical marker, first the staining was determined as negative or positive. Then if there is a staining, the hot zone (the area containing more positive cells) was determined and staining percentage (SP) was assessed by counting positive cells/100 epithelial cells). RESULTS: Solar elastosis, edema, inflammation, and epithelial dysplasia were found statistically different between the control group and the patient group (P value <0.001, <0.001, <0.001 <0.001, respectively). A significant difference was found for staining percentage (SP) of Ki-67, p53, BCL-2 between the control group and the patient group (P values <0.001, 0.002, <0.001, respectively). There were no significant differences in the SP of Cyclin D1 between the two groups (p: 0,133). CONCLUSIONS: Our results indicate an abnormal expression of p53, BCL-2 and elevated proliferation measured by Ki-67 in pterygium samples when compared to normal conjunctiva. Besides the mesenchymal changes, the increased proliferation and the failure of apoptosis in the epithelial cells participate in the development of pterygium, as well.

The extent of cyclin D1 expression in endometrial pathologies and relevance of cyclin D1 with the clinicopathological features of endometrioid endometrial carcinoma.

BACKGROUND: Cyclin D1, a member of the cyclin protein family, is instrumental in the cell cycle due to its influence on the progression from G1 to the S phase. Its overexpression causes reduced doubling time and is also associated with clonogenic growth. The purpose of the present study was to assess cyclin D1 expression in patients with simple hyperplasia (SH), endometrial intraepithelial neoplasia (EIN) and endometrioid endometrial carcinoma, and to evaluate whether there was an association between cyclin D1 expression and the clinicopathological features of endometrioid endometrial carcinoma. METHODS: Retrospective data were available for 193 patients (30 SH, 40 EIN, and 123 endometrioid endometrial carcinoma cases). To detect cyclin D1 expression, immunohistochemistry staining was performed with tissue microarrays. RESULTS: The percentage of cases with positive cyclin D1 staining were 30%, 60% and 78%, for SH, EIN and endometrioid endometrial carcinoma, respectively (P < 0.001). Carcinomas with higher nuclear grade, histological grade, and FIGO grade displayed higher mean cyclin D1 expression compared to lower grade carcinomas. In addition, patients with lymphovascular invasion (P = 0.006), myometrial invasion (P < 0.001) and lymph node invasion (P < 0.001) had higher mean cyclin D1 expression compared to those without invasion. There was a significant correlation between cyclin D1 expression and clinicopathological features of endometrioid endometrial carcinoma including tumor grade, FIGO grade, lymphovascular invasion, lymph node invasion and myometrial invasion (P < 0.05 for each). CONCLUSION: Cyclin D1 expression is significantly higher in patients with endometrioid endometrial carcinoma compared to that of the SH and EIN. The extent of cyclin D1 expression is strongly correlated with nuclear and histological grade, myometrial invasion, lymphovascular invasion and lymph node invasion in patients with endometrioid endometrial carcinoma. These findings contribute in several ways to our understanding of cyclin D1 expression and provide a basis for future research on this topic.