Combined effects of nutrition, inflammatory status, and sleep quality on mortality in cancer survivors.

Background: Cancer survivors face many challenges in long-term health management, including malnutrition, systemic inflammation, and sleep issues, which significantly affect their survival and quality of life.

Methods: A prospective cohort study was derived from the National Health and Nutrition Examination Survey from 2005-2018 harboring 1,908 cancer survivors (weighted population, 11,453,293), of whom 688 deaths (220 from cancer mortality, 468 from non-cancer mortality). The Advanced Lung Cancer Inflammation Index (ALI) was used as a measure of nutritional status and systemic inflammation in cancer patients. Weighted multivariable Cox proportional hazards regression models were utilized to explore the independent and combined effects of ALI and sleep quality on mortality outcomes.

Results: The participants with a high ALI were more likely to be female, aged 40 to 64 years, non-Hispanic white, and have a higher BMI. We observed that elevated ALI levels were associated with decreased risks of all-cause mortality (Hazard ratio [HR] = 0.601, 95% Confidence interval [CI] = 0.521-0.695, P < 0.001), cancer-specific mortality (HR = 0.659, 95% CI = 0.497-0.870, P = 3.34 × 10^-3) and non-cancer-specific mortality (HR = 0.579, 95% CI = 0.478-0.701, P < 0.001). Similarly, better sleep quality (e.g., without sleep troubles) was associated with lower risks of all-cause mortality (HR = 0.761, 95% CI = 0.620-0.933, P = 8.79 × 10^-3) and non-cancer-specific mortality (HR = 0.713, 95% CI = 0.572-0.890, P = 2.80 × 10^-3). Notably, the joint analysis showed that cancer survivors with higher ALI levels and better sleep quality (e.g., standard sleep duration) had the lowest risks of all-cause (HR = 0.468, 95% CI = 0.352-0.622, P < 0.001), cancer-specific mortality (HR = 0.631, 95% CI = 0.333-0.672, P = 7.59 × 10^-3) and non-cancer-specific mortality (HR = 0.440, 95% CI = 0.315-0.615, P < 0.001).

Conclusions: This study suggests that better nutritional and inflammatory status, combined with good sleep quality, may contribute to improved survival among cancer survivors. These results underscore the potential clinical importance of integrating nutritional and sleep quality assessments into the long-term care of cancer survivors to enhance their overall prognosis.