Socioeconomic status and cardiovascular mortality in over 170,000 cancer survivors: a population-based cohort study

Abstract Background Cardiovascular health is acknowledged as a crucial concern among cancer survivors. Purpose We designed the current study to explore the relationship between socioeconomic status (SES) and cardiovascular disease (CVD) outcomes in cancer survivors. Methods Using the National Health Insurance Service-National Health Examinee database, we identified cancer survivors diagnosed and surviving beyond 5 years post-diagnosis. SES was assessed based on insurance premiums and classified into 5 groups. The primary outcome was death from any CVD. Results This study analyzed 170,555 individuals (mean age 60.7 ± 11.9 years, 57.8% female). A gradual increase in risk was observed across SES groups: adjusted hazard ratios (95% confidence intervals) for overall CVD mortality were 1.20 (1.09-1.33), 1.37 (1.23-1.54), 1.38 (1.24-1.54), and 2.42 (1.48-3.96) for the second, third, and fourth quartile, and medical aid group (the lowest SES group) compared to the highest SES group, respectively. The medical aid group with hypertension exhibited a 3.4-fold higher risk of CVD mortality compared to the highest SES group without hypertension. The relative excess risk due to interaction between medical aid and hypertension was 1.30, and the synergy index was 1.62. Conclusions Low SES and hypertension are both linked to a higher risk of CVD mortality. The present study suggests that low SES, particularly the lowest SES group, synergistically interacts with hypertension, amplifying the risk of CVD mortality.