Background: Cyclin D1, a positive regular of the cell cycle, may lead to uncontrolled cell proliferation. Overexpression of Cyclin D1 has been associated with the diagnosis and prognosis of numerous tumors. PIN1 binds and isomerizes the phosphorylated serine/threonine–proline motif, which lead to alteration in the structure and function of proteins. The altered phosphorylated proteins by PIN1 are closely linked to development of cancer. PIN1 is strongly expressed in the majority of tumors, suggesting it promotes tumorigenesis, and negatively associated with the clinical prognosis.
Objectives: To assess Cyclin D1 & PIN1 expression and correlation in endometrial adenocarcinoma. Also to assess the relationship between Cyclin D1 & PIN1 expression and clinico-pathological variables of cases of endometrial carcinoma.
Materials and Methods: Study included 30 cases of endometrial adenocarcinoma specimens. Immunohistochemical staining was performed for both Cyclin D1 and PIN1. Blocks of tumor tissue and clinical data were gathered from the files of Pathology Department of Al-Zahraa University Hospital, between July 2017 and October 2019.
Results: Cyclin D1 positive expression and PIN1 high expression were increased significantly with age, high clinical stage, high pathological grade and more myometrium invasion depth. Cyclin D1 expression was positively associated with PIN1 expression (P-value = 0.004).
Conclusions: Cyclin D1 & PIN1 expression associated with age, stage, grade and depth of myometrial wall invasion in patients with endometrial carcinoma. The overexpression of Cyclin D1 & PIN1 seems to indicate a more malignant phenotype of endometrial carcinoma.