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Multicenter Study
. 2019 Jun 12;9(1):8580.
doi: 10.1038/s41598-019-44969-8.

The effects of comorbidity on colorectal cancer mortality in an Australian cancer population

Maleshwane Lettie Pule  1 , Elizabeth Buckley  2 , Theophile Niyonsenga  2   3 , David Roder  2
Affiliations
Multicenter Study

The effects of comorbidity on colorectal cancer mortality in an Australian cancer population

Maleshwane Lettie Pule et al. Sci Rep. .

Abstract

This study estimated the absolute risk of colorectal cancer (CRC) specific and other-cause mortality using data from the population-based South Australian Cancer Registry. The impact of competing risks on the absolute and relative risks of mortality in cases with and without comorbidity was also investigated. The study included 7115 staged, primary CRC cases diagnosed between 2003 and 2012 with at least one year of follow-up. Comorbidities were classified according to Charlson, Elixhauser and C3 comorbidity indices, using hospital inpatient diagnoses occurring five years before CRC diagnosis. To estimate the differences in measures of association, the subdistribution hazard ratios (sHR) for the effect of comorbidity on mortality from the Fine and Gray model were compared to the cause-specific hazards (HR) from Cox regression model. CRC was most commonly diagnosed in people aged ≧ 70 years. In cases without comorbidity, the 10-year cumulative probability of CRC and other cause mortality were 37.1% and 17.2% respectively. In cases with Charlson comorbidity scores ≥2, the 10-year cumulative probability of CRC-specific and other cause mortality was 45.5% and 32.2%, respectively. Comorbidity was associated with increased CRC-specific and other cause mortality and the effect differed only marginally based on comorbidity index used.

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Conflict of interest statement

The authors declare no competing interests.

Figures

Figure 1
Figure 1
Number of comorbid conditions identified by generic CCI, ECI and cancer-specific C3 indexes.
Figure 2
Figure 2
Cumulative probability of deaths from CRC and other causes for the entire CRC cohort over a 10-year follow up period.
Figure 3
Figure 3
Cumulative probability of deaths from CRC and other causes for the entire CRC cohort over a 10-year follow up period by CCI score.
See this image and copyright information in PMC

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