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Published on: July 25, 2020
Cyclin E amplification and overexpression in clear cell adenocarcinoma of the ovary
Hiroshi Tsuda1, Christina A Bandera, Michael J Birrer
1Department of Obstetrics and Gynecology, Division of Gynecologic Oncology, Brigham and Women's Hospital, Harvard Medical School, Boston, MA 02115, USA.
Objective:
The purpose of this study is to compare DNA, mRNA and protein levels of the cyclin E between clear cell (CC) and serous (SC) ovarian carcinomas, and evaluate the relationship between cyclin E and p53 status.
Method:
We examined the DNA, mRNA and protein levels of cyclin E and the protein level of p53 in 44 CCs and 39 SCs using microdissected tissues.
Results:
Relative cyclin E mRNA expression was significantly higher in CC (3.62, 95% CI, 2.24-4.99) than in SC (1.75, 95% CI, 1.05-2.45; p = 0.0098). The percentage of positive nuclear staining of cyclin E was significantly higher in CC (48.3, 95% CI, 40.4-56.1) than SC (25.3, 95% CI, 17.4-33.3; p = 0.0001). The mRNA and protein expression of cyclin E was significantly correlated (r = 0.66, p < 0.0001). However, the correlation between relative DNA copy number and relative mRNA expression was not significant (r = -0.063; p = 0.66). Percentage of positive nuclear staining of cyclin E was significantly higher in p53 positive cases (51.8, 95% CI, 40.0-63.5) than p53 negative cases (36.2, 95% CI, 28.2-44.2; p = 0.028).
Conclusions:
Cyclin E expression is significantly higher in CC than in SC. Cyclin E expression is significantly related with p53 positivity.
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