Background Depression and vitamin D deficiency are common in patients with lung cancer and have prognostic implications in cancer settings. However, their relationship and concomitant survival implications have not been evaluated in patients with metastatic lung cancer specifically. We hypothesised that vitamin D deficiency would be associated with depression and inferior cancer-related survival in patients receiving therapies for stage IV lung cancer.
Methods This was a cross-sectional analysis of vitamin D, depression and lung cancer characteristics. Vitamin D levels were stratified by level (no deficiency ≥30 units, mild deficiency 20 to 29 units and moderate-to-severe <20 units). Depression was measured by the Hospital Anxiety and Depression Scale-Depression (HADS-D). Survival estimations were made using Cox proportional hazard model and Kaplan-Meier analyses.
Results Vitamin D deficiency was evident in almost half of the sample (n=98) and was associated with significant depression (HADS-D ≥8) (χ2=4.35, p<0.001) even when controlling for age, sex and inflammation (β=-0.21, p=0.03). Vitamin D deficiency and depression were associated with worse survival and showed evidence of an interaction effect (HR 1.5, p=0.04).
Conclusion Vitamin D deficiency is associated with depression in patients with metastatic lung cancer. Depression modulates the survival implications of vitamin D deficiency in this population. The role of vitamin D deficiency in cancer-related depression warrants further investigation since both are amenable to treatment. Psychological and nutritional prognostic considerations may help inform treatment paradigms that enhance quality of life and survival.
- metabolic disorders
- supportive care
- psychological care
Data availability statement
Data are available upon reasonable request. Data are available upon request.
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Contributors DCMF and CN designed and directed the project; DCMF and CN collected data. All authors (DCMF, MF, WSB and CN) were involved in data analysis and interpretation. All authors wrote the article. DCMF is the corresponding author and is responsible for the overall content as guarantor.
Funding This research was supported by the NIH/NCI Cancer Center Support Grant [P30 CA008748] and the NIH Loan Repayment Program L30 CA220778.
Competing interests None declared.
Provenance and peer review Not commissioned; externally peer reviewed.