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Alteration of cell cycle regulators correlates with survival in epithelial ovarian cancer patients

Yasunori Hashiguchi1, Hiroshi Tsuda, Takeshi Inoue

  • 1Department of Obstetrics and Gynecology, Osaka City General Hospital, Japan.

Human Pathology
|March 3, 2004
PubMed

Insights

Alterations in the RB pathway and G2 pathway are linked to poorer survival in epithelial ovarian cancer (EOC) patients. These pathway statuses are independent prognostic factors for EOC, but not related to chemotherapy response.

Area of Science:

  • Oncology
  • Molecular Biology
  • Cancer Research

Background:

  • Cell cycle checkpoints, including the G1-S and G2-M phases, are crucial for preventing uncontrolled cell proliferation.
  • Dysregulation of key regulatory pathways like the RB and p53 pathways is implicated in various human cancers, including epithelial ovarian cancer (EOC).
  • Understanding the prognostic significance of these cell cycle pathway alterations in EOC is essential for improving patient outcomes.

Purpose of the Study:

  • To investigate the status of the RB pathway, p53 pathway, and G2 pathway in epithelial ovarian cancer (EOC) patients.
  • To evaluate the association between the status of these cell cycle pathways and patient prognosis, specifically overall survival (OS).
  • To determine if pathway status correlates with response to chemotherapy in EOC.

Main Methods:

  • Immunohistochemistry was employed to analyze the status of the RB, p53, and G2 pathways in 107 epithelial ovarian cancer (EOC) patient samples.
  • Kaplan-Meier analysis and univariate/multivariate analyses were conducted to assess the relationship between pathway status and overall survival.
  • Chemotherapy response data was analyzed in conjunction with pathway status.

Main Results:

  • Altered RB, p53, and G2 pathways were observed in 50.5%, 51.4%, and 33.6% of EOC cases, respectively.
  • Patients with a normal RB pathway exhibited significantly higher overall survival (77.3%) compared to those with an altered RB pathway (50.0%; P = 0.0021).
  • A normal G2 pathway was associated with significantly better OS (66.2%) than an altered G2 pathway (58.3%; P = 0.0416), while p53 pathway status showed no OS correlation. Advanced stage, high histological grade, and altered RB/G2 pathways predicted poor OS.

Conclusions:

  • The status of the RB pathway and the G2 pathway are independent prognostic factors for overall survival in epithelial ovarian cancer (EOC).
  • Altered RB and G2 pathways are significant predictors of poor prognosis in EOC patients.
  • Pathway status did not demonstrate a significant relationship with chemotherapy response in this cohort.

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