Negative impact of comorbidities on all-cause mortality of patients with psoriasis is partially alleviated by biologic treatment: A real-world case-control study

Background Cardiovascular comorbidities are believed to cause higher mortality in psoriasis patients. Conversely, systemic therapy may improve overall survival. Objective To evaluate the impact of different comorbidities and therapy on mortality risk of psoriasis patients in the entire population of Alberta, Canada (population 4.37 million). Methods Cohorts of psoriasis cases (n=18,618) and controls (ambulatory patients matched 1:3 by by age, and sex) were retrieved from Alberta Health Services Data Repository of Reporting database within the period 2012-2019. Cases were stratified according to Charlson Comorbidity Index (CCI), and the type of therapy. Results Mortality in psoriasis cohort was significantly higher than in the controls (median age of death 72.0 years vs 74.4 years, respectively). CCI and comorbidities were strong predictors of mortality, in particular drug induced liver injury (hazard ratio HR 1.8, affective bipolar disease, HR 1.6, and major cardiovascular diseases. Mortality was lower in patients treated with biologics (HR 0.54). Limitations Some factors (psoriasis type and severity, response to treatment, smoking, alcohol intake) could not be measured. Conclusions Hepatic injury, psychiatric affective disorders and cardiovascular disease were major determinants of overall survival in psoriasis. Biologic therapy was associated with a reduced mortality risk.