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Abstract
Highlights
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- Self-reported comorbidity is useful for risk-assessment in ovarian cancer.
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- This new comorbidity index risk-scores patients according to overall survival.
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- The index may help to ensure individualized treatment of ovarian cancer patients.
Objective
To
develop and validate a new feasible comorbidity index based on
self-reported information suited for preoperative risk assessment of
ovarian cancer patients.
Methods
The
study was based on patient self-reported data from ovarian cancer
patients registered in the Danish Gynecological Cancer Database between
January 1, 2005 and December 31, 2012. The study population was divided
into a development cohort (n = 2020) and a validation cohort (n = 1975).
Age-stratified multivariate Cox regression analyses were conducted to
identify comorbidities significantly impacting five-year overall
survival in the development cohort, and regression coefficients were
used to construct a new weighted comorbidity index. The index was
applied to the validation cohort, and its predictive ability in regard
to overall and cancer-specific five-year-survival was investigated.
Finally, the performance of the new index was compared to that of the
Charlson Comorbidity Index.
Results
Regression
coefficients of age and five comorbidities (atherosclerotic cardiac
disease, chronic obstructive pulmonary disease, diabetes, dementia and
hypertension) were included in the new comorbidity index. The validation
study found the new index to be significantly associated to both
overall survival (HR 1.44, p = 0.013) and cancer-specific survival (HR 1.51, p = 0.017)
in multivariate analyses adjusted for other prognostic factors. The
index was a significantly better predictor than the Charlson Comorbidity
Index.
Conclusion
This new
age-specific comorbidity index based on self-reported information is a
significant predictor of overall and cancer-specific survival in ovarian
cancer. It can be used to quickly identify those ovarian cancer
patients requiring special attention in terms of preoperative
optimization and postoperative care.
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