Prevalence and incidence of various Cancer subtypes in patients with heart failure vs matched controls.

Abstract Background Patients with heart failure (HF) may be at increased risks of cancer, but the magnitude of risk for various cancer subtypes is insufficiently investigated. Method Using the Danish Nationwide administrative databases between 1997 and 2017, we estimated the prevalence, incidence and relative risk for all-cause cancer in new-diagnosed HF vs. age and sex-matched controls (up to 5 controls per HF case) before and after adjustment for comorbidities. Results Among the 167,633 people in the heart failure group and 837,126 individuals in the control group, there was a higher prevalence of several comorbidities, including cancer (17% vs. 10%) in the HF group; odds ratio 1.72 (1.70–1.75). Patients with heart failure also had higher cancer incidence (cancer incidence rate 3.02 [2.97–3.07] per 100 person-years), compared with controls (cancer incidence rate 1.89 [1.88–1.90]); hazards ratio 1.38 (1.36–1.40). However, after adjustment for comorbidities the increased risk of malignancy was greatly attenuated (hazards ratio 1.14 [1.12–1.16] for incident all-cause cancer) and dissipated altogether after additional adjustment for medications (multivariable adjusted hazards ratio 0.93 [0.91–0.96] for all-cause cancer). In a homogeneous cohort of patients with ischemic heart disease, the increased risk of all-cause cancer was only marginally increased after adjustment for baseline comorbidities (hazards ratio 1.05 [1.02–1.08]). Conclusion Patients with heart failure had a slightly increased risk of various cancer subtypes, but the risks were mainly driven by comorbidities.