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Int J Gynecol Cancer. 2010 Aug;20(6):945-52. doi: 10.1111/IGC.0b013e3181dd0110.

Prognostic relevance of uncommon ovarian histology in women with stage III/IV epithelial ovarian cancer.

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  • 1National Cancer Institute of Canada Clinical Trials Group (NCIC CTG), Kingston, Ontario, Canada. Helen.Mackay@uhn.on.ca

Abstract

BACKGROUND:

The prognostic relevance of uncommon epithelial ovarian cancer (EOC) histological subtypes remains controversial. The Gynecologic Cancer InterGroup (GCIG) initiated this meta-analysis to assess the relative prognosis of women with a diagnosis of rare EOC histologies from completed, prospectively randomized studies performed by cooperative GCIG study groups.

METHODS:

Studies eligible for analysis included first-line treatment of at least 150 patients with stage III/IV EOC treated with a platinum/taxane-based regimen. Collaborating groups were to provide patient-level data. Serous acted as the reference histology, and a proportional hazards model was used to estimate the relative rate of progression or death.

RESULTS:

Data on 8704 women with stage III/IV EOC from 7 randomized trials were included in these analyses. Two hundred twenty-one patients (2.5%) had clear cell carcinoma; 264 (3.0%), mucinous; and 36 (0.4%), transitional cell. The mean age of patients with serous histology was greater than those with mucinous (4.1 years) and clear cell (2.6 years, P < 0.001). Mucinous, clear cell, and transitional cell tumors were more likely to be completely resected than serous (P < 0.05). When controlling for age and residual disease, mucinous and clear cell tumors had shorter times to progression (hazards ratio [HR], 2.1; 95% confidence interval [CI], 1.8-2.4 and HR, 1.6; 95% CI, 1.4-1.9, respectively) and death (HR, 2.7; 95% CI, 2.3-3.1 and HR, 2.2; 95% CI, 1.8-2.6, respectively) compared with serous. The median overall survival for serous, clear cell, mucinous, and endometrioid histologies were 40.8, 21.3, 14.6, and 50.9 months.

CONCLUSIONS:

Mucinous and clear cell carcinomas are independent predictors of poor prognosis in stage III/IV EOC. Studies targeting these rare histological subtypes are warranted and will require significant intergroup collaboration.

PMID:
20683400
[PubMed - indexed for MEDLINE]
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