Analysis of drug utilization and health care resource consumption in patients with psoriasis and psoriatic arthritis before and after treatment with biological therapies.

Objectives: To describe the therapeutic pathways of patients with psoriasis (PSO) and psoriatic arthritis (PsA) before and after treatment with biological therapies in a real-world setting and to determine the relative consumption of health care resources.

Design: Retrospective observational study.

Setting: Real-life clinical setting in 5 Italian local health units.

Participants: A total of 351 male and female patients with at least 1 prescription for a biological drug from January 1, 2010 to December 31, 2013; patients with concomitant rheumatoid arthritis, ankylosing spondylitis, or Crohn's disease were excluded.

Results: The major health care cost (excluding drug costs) was represented by hospitalizations, mainly related to PSO /PsA-associated disorders and cardiometabolic disorders. Use of conventional drugs among biologics-naïve patients reached 50% in PSO and 80% in PsA; their use decreased following initiation of biological therapy. After the start of biological treatment, the incidence of hospitalization decreased both for PSO (from 12.3% to 3.2% in day hospital regimen and from 2.4% to 0.4% for conventional admission) and for PsA (from 11.1% to 8.1% and from 10.1% to 3.0%, respectively). Mean annual costs for hospitalization before biological treatment were €217 and €537 for PSO and PsA, respectively, while mean annual cost for concomitant drugs slightly increased after biologics initiation: from €249.8 to €269.4 for PSO and from €331.8 to €346.9 for PsA. The major consumption of health care resources occurred in the quarter preceding the beginning of biological treatment.

Conclusion: The consumption of health resources is mostly related to hospitalization, seems to peak during the quarter before the beginning of biologics therapies, and subsequently decreases after biologics initiation. Further studies should focus on prescription scheme and economic burden of PSO and PsA in Italy to help optimize health care resources and potentiate services for patients.