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Bcl-2 protein expression is associated with p27 and p53 protein expressions and MIB-1 counts in breast cancer

By Nishizaki Takashi, Takeuchi Hideya, Suzuki Kosuke, Yasuda Kazuhiro, Tsutsui Shinichi, Higashi Hidefumi and Era Shoichi


<p>Abstract</p> <p>Background</p> <p>Recent experimental studies have shown that Bcl-2, which has been established as a key player in the control of apoptosis, plays a role in regulating the cell cycle and proliferation. The aim of this study was to investigate the relationship between Bcl-2 and p27 protein expression, p53 protein expression and the proliferation activity as defined by the MIB-1 counts. The prognostic implication of Bcl-2 protein expression in relation to p27 and p53 protein expressions and MIB-1 counts for breast cancer was also evaluated.</p> <p>Methods</p> <p>The immunohistochemical expression of Bcl-2 protein was evaluated in a series of 249 invasive ductal carcinomas of the breast, in which p27 and p53 protein expressions and MIB-1 counts had been determined previously.</p> <p>Results</p> <p>The Bcl-2 protein expression was found to be decreased in 105 (42%) cases. A decreased Bcl-2 protein expression was significantly correlated with a nuclear grade of III, a negative estrogen receptor, a decreased p27 protein expression, a positive p53 protein expression, positive MIB-1 counts and a positive HER2 protein expression. The incidence of a nuclear grade of III and positive MIB-1 counts increased as the number of abnormal findings of Bcl-2, p27 and p53 protein expressions increased. A univariate analysis indicated a decreased Bcl-2 protein expression to be significantly (p = 0.0089) associated with a worse disease free survival (DFS), while a multivariate analysis indicated the lymph node status and MIB-1 counts to be independently significant prognostic factors for the DFS.</p> <p>Conclusion</p> <p>The Bcl-2 protein expression has a close correlation with p27 and p53 protein expressions and the proliferation activity determined by MIB-1 counts in invasive ductal carcinoma of the breast. The prognostic value of Bcl-2 as well as p27 and p53 protein expressions was dependent on the proliferation activity in breast cancer.</p

Topics: Neoplasms. Tumors. Oncology. Including cancer and carcinogens, RC254-282, Internal medicine, RC31-1245, Medicine, R, DOAJ:Oncology, DOAJ:Medicine (General), DOAJ:Health Sciences
Publisher: BioMed Central
Year: 2006
DOI identifier: 10.1186/1471-2407-6-187
OAI identifier:
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