Abstract
The California Behavioral Risk Factor Surveillance System estimates that 56.6 % of cancer survivors report ever being diagnosed with a chronic disease. Few studies have assessed potential variability in comorbidity by cancer type. We used data collected from a representative sample of adult participants in the 2009 and 2010 California Behavioral Risk Factor Surveillance System (n = 18,807). Chronic diseases were examined with cancer survivorship in case/non-case and case/case analyses. Prevalence ratios (PR) and corresponding 95 % confidence intervals (95 % CI) were estimated using Cox proportional hazards models, with adjustment on race, sex, age, education, smoking, and drinking. Obesity was associated with gynecological cancers (PR 1.74; 95 % CI 1.26-2.41), and being overweight was associated with gynecological (PR 1.40; 95 % CI 1.05-1.86) and urinary (PR 2.19; 95 % CI 1.21-3.95) cancers. Arthritis was associated with infection-related (PR 1.78; 95 % CI 1.12-2.83) and hormone-related (PR 1.20; 95 % CI 1.01-1.42) cancers. Asthma was associated with infection- (PR 2.26; 95 % CI 1.49-3.43), hormone- (PR 1.46; 95 % CI 1.21-1.77), and tobacco- (PR 1.86; 95 % CI 1.25-2.77) related cancers. Chronic obstructive pulmonary disease (COPD) was associated with infection- (PR 2.16; 95 % CI 1.22-3.83) and tobacco-related (PR 2.24; 95 % CI 1.37-3.66) cancers and with gynecological cancers (PR 1.60; 95 % 1.00-2.56). This is the first study to examine chronic disease burden among cancer survivors in California. Our findings suggest that the chronic disease burden varies by cancer etiology. A clear need has emerged for future biological and epidemiological studies of the interaction between chronic disease and cancer etiology in survivors.
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