The inverse palliative care law in advanced lung disease: a mixed-methods systematic review and meta-analysis.

Background: People from socioeconomically deprived backgrounds are at greater risk of developing lung disease and having a higher symptom burden. It remains unclear whether they have equitable access to and experience of palliative care. Therefore, we aimed to synthesise evidence on socioeconomic inequalities in access, receipt of, preference for, and experience of palliative care among people with advanced lung disease. Methods: Mixed-methods systematic review, searching four databases (MEDLINE, Embase, PsychINFO, CINAHL) from inception to March 28, 2025. We included studies that reported on socioeconomic position and palliative care in advanced lung disease (lung cancer, mesothelioma, chronic obstructive pulmonary disease, interstitial lung disease). Study quality was assessed using the Mixed Methods Appraisal Tool. Both meta-analysis (using a random effects model with I Findings: Of 10,572 records, 54 studies met inclusion criteria (4.2 million participants). Meta-analysis of six studies showed people with lung cancer in the lowest SEP group were 18% less likely to receive palliative care than those in the highest (OR 0.82, 95% CI 0.75-0.90, I Interpretation: This review provides novel evidence of how the inverse care law operates in advanced lung disease. People from lower socioeconomic groups are significantly less likely to access palliative care, despite greater need. There is an urgent need for equity-focused research and policy interventions, co-produced with underserved communities that account for intersecting social disadvantages. Funding: National Institute for Health and Care Research.