Association of Life's Simple 7 with incident cardiovascular disease in 53 974 patients with cancer

Aims: Cancer survivors have a greater risk of cardiovascular disease (CVD). Although Life's Simple 7 is used for CVD risk stratification in a general population, its utility in cancer survivors remains unknown. We aimed to clarify the association of Life's Simple 7 with incident CVD among cancer survivors. Furthermore, we analyzed the relationship between the change in Life's Simple 7 and the subsequent CVD risk.

Methods and results: This retrospective observational study was conducted using the JMDC Claims Database, and we analyzed 53 974 patients with a prior history of breast, colorectal, or stomach cancer, which is a common cancer site in the Japanese population. The median age was 54 years, and 37.8% were men. We modified the original definition of Life's Simple 7 and identified the following ideal Life's Simple 7 cardiovascular health metrics: non-smoking, body mass index < 25 kg/m2, physical activity at goal, optimal dietary habits, untreated fasting plasma glucose < 100 mg/dL, untreated blood pressure < 120/80 mmHg, and untreated total cholesterol < 200 mg/dL. The primary endpoint was composite CVD outcome, including myocardial infarction, angina pectoris, stroke, and heart failure. Over a mean follow-up period of 975 ± 794 days, 3150 composite CVD outcomes were recorded. The risk of CVD events increased with a greater number of non-ideal Life's Simple 7. The hazard ratio per 1-point increase in non-ideal Life's Simple 7 was 1.15 [95% confidence interval (CI): 1.12-1.18). Furthermore, a 1-point increase in non-ideal Life's Simple 7 over 1 year was associated with subsequent CVD risk (hazard ratio: 1.12, 95% CI: 1.06-1.19).

Conclusion: Life's Simple 7 could be applicable for CVD risk stratification even among cancer survivors. Optimizing Life's Simple 7 may prevent the development of CVD in cancer survivors.