Patient-reported comorbidity and survival in older adults with cancer.
10033 Background: Our ability to optimize the care of older adults with cancer and comorbid illnesses is insufficient as most clinical trials lack systematic measurement of comorbidities. The primary purpose of this study was to evaluate the prevalence and impact of patient-reported comorbidity on survival using various comorbidity scoring algorithms. Methods: We utilized a unique linkage of the Carolina Senior Registry, an institutional registry (NCT01137825) that contains geriatric assessment data, with the North Carolina Central Cancer Registry to obtain mortality data. Comorbidity was assessed using a patient-reported version of the Older Americans Resources and Services Questionnaire (OARS) Physical Health subscale that includes information regarding 13 specific comorbid conditions and the degree to which each impairs function (“not at all” to “a great deal”). Multivariable Cox proportional hazard regression models were used to evaluate the association between comorbidities and all-cause mortality. Results: 539 patients were successfully linked to mortality data. Median age 72, 72% female, 85% Caucasian, 47% breast cancer, and 12% lung cancer. 92% of participants reported at least one comorbid condition, mean of 2.7 conditions (range 0-10), with arthritis and hypertension the most common (52 and 50%, respectively). 62% of patients with a comorbid illness reported a functional limitation related to comorbidity. Both the presence of 3 or more total comorbidities (hazard ratio (HR) 1.44, CI 1.08-1.92) and 2 or more comorbidities impacting function (HR 1.46, CI 1.09-1.95) increased mortality. After adjusting for age, cancer type, and stage, the risk of death increased 12% for each comorbid condition impacting function (HR 1.12, CI 1.02-1.24), but did not significantly increase for the number of comorbid conditions alone (HR 1.07, CI 0.99-1.15). Conclusions: Comorbid conditions in older adults with cancer are highly prevalent, frequently impair function, and impact survival. Comorbid conditions that impair function have a greater impact on survival than the presence of comorbidity alone. Comorbidity assessment should be incorporated in clinical trials and can be measured via a simple one-page patient-reported questionnaire.