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. 2017 Aug;49:66-74.
doi: 10.1016/j.canep.2017.05.010. Epub 2017 Jun 3.

Impact of Comorbidity on Survival by Tumour Location: Breast, Colorectal and Lung Cancer (2000-2014)

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Impact of Comorbidity on Survival by Tumour Location: Breast, Colorectal and Lung Cancer (2000-2014)

Oleguer Parés-Badell et al. Cancer Epidemiol. .

Abstract

Background: To assess the impact of comorbidity, measured by the Charlson Comorbidity Index (CCI), on survival in breast, colorectal and lung cancer.

Methods: We identified 3455 breast cancer, 3336 colorectal cancer and 2654 lung cancer patients through the Hospital del Mar cancer registry. The prevalence of comorbidities according to the CCI was calculated. Kaplan-Meier curves and the log-rank test were used to compare survival curves for each cancer location. Cox regression was used to calculate survival hazard ratios and 1-, 3- and 5-year mortality rate ratios adjusted by age, sex, CCI, place of first consultation, stage, treatment and period of diagnosis.

Results: The overall unadjusted 5-year follow-up survival proportion was 82.6% for breast cancer, 55.7% for colorectal cancer, and 16.3% for lung cancer. Overall survival was associated with CCI≥3 in breast cancer (HR: 2.33 95%CI: 1.76-3.08), colorectal cancer (HR: 1.39; 95%CI: 1.13-1.70) and lung cancer (HR: 1.22; 95%CI: 1.06-1.40). In breast cancer, the higher the CCI, the higher the adjusted mortality rate ratio and differences were greater in 5-year than in 1-year follow-up survival.

Conclusions: Comorbidity is a significant predictor of overall survival in cancer patients; however, it has a stronger impact on survival in breast cancer than in colorectal and lung cancer.

Keywords: Breast cancer; Colorectal cancer; Comorbidity; Lung cancer; Survival.

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