Disparity in health care in end-of-life among patients with lung cancer and pre-existing mental disorders: A nationwide cohort study.

Background: Research focusing on health care in end-of-life among cancer patients with mental disorders is limited and presents inconsistent findings.

Objective: To investigate disparities in health care in end-of-life among patients who died from lung cancer according to pre-existing mental disorders.

Methods: A Danish nationwide cohort study linking nationwide registries on health care in end-of-life including specialist palliative care (including hospice admissions), 'drug reimbursement for terminal illness', high-intensity-treatment during the last 30 days before death and death at hospital, analysed using Poisson regression, adjusted for sociodemographic and clinical factors. Methods: All adult decedents who died of lung cancer in Denmark from 2011 through 2020, including individuals with mental diagnoses prior to their cancer diagnosis.

Results: Among 36,323 patients dying from lung cancer, 12% had pre-existing mental disorders. Patients with mental disorders were less likely to receive specialist palliative care (adjusted risk ratio (RR) 0.90; 95% CI: 0.87; 0.94), hospice admissions (RR: 0.86; 95% CI: 0.80; 0.94), chemotherapy (RR: 0.66; 95% CI: 0.57; 0.76), radiotherapy (RR: 0.82; 95% CI: 0.74; 0.92), surgery (RR: 0.47; 95% CI: 0.22; 1.00), hospital admissions (RR: 0.96; 95% CI: 0.92; 0.99) and to die in a hospital (RR: 0.88; 95% CI: 0.85; 0.91), compared to patients without mental disorders. No disparities were observed in receiving drug reimbursement, admissions to intensive care units or emergency care.

Conclusions: Pre-existing mental disorders were associated with a lower probability of specialist palliative care, but also some high-intensity-treatments in end-of-life. These patients may be deprived of optimal palliative care but also appeared less subjected to possible overtreatment in end-of-life compared to patients without mental disorders.