Utility of the Dermatology Life Quality Index at initiation or switching of biologics in real-life Japanese patients with plaque psoriasis: Results from the ProLOGUE study

Background: Plaque psoriasis significantly affects patients' health-related quality of life. To aid treatment decisions, not only objective assessment by physicians but also subjective assessment by patients is important. Objective: To assess the significance of Dermatology Life Quality Index (DLQI) evaluation at the time of biologics introduction in clinical practice in Japanese patients with plaque psoriasis. Methods: This was a single-arm, open-label, multicenter study. At baseline, Psoriasis Area and Severity Index (PASI) and DLQI scores were measured and stratified based on DLQI scores >= 6/<= 5 and PASI scores <= 10/>10. Other patient-reported outcomes assessed included EQ-5D-5L, itch numerical rating scale (NRS), skin pain NRS, Generalized Anxiety Disorder-7 (GAD-7), Patient Health Questionnaire-8 (PHQ-8), Sleep Problem Index-II (SPI-II), and Treatment Satisfaction Questionnaire for Medication-9 (TSQM-9). Results: Of the 73 enrolled patients, 23 had PASI scores <= 10. Those with PASI/DLQI scores >10/>= 6 had a significantly higher median PASI score than those with PASI/DLQI scores >10/<= 5 (p = 0.0125). Regardless of PASI scores (>10/<= 10), median itch NRS and GAD-7 scores were significantly higher in patients with DLQI scores >= 6 than in those with DLQI scores <= 5 (itch NRS, p = 0.0361 and p = 0.0086, respectively; GAD-7, p = 0.0167 and p = 0.0273, respectively). Patients with PASI/DLQI scores <= 10/>= 6 had significantly higher skin pain NRS (p = 0.0292) and PHQ-8 (p = 0.0255) scores and significantly lower median SPI-II scores (p = 0.0137) and TSQM-9 Effectiveness domain scores (p = 0.0178) than those with PASI/DLQI scores <= 10/<= 5. Conclusion: DLQI may be useful for assessing patients' concerns that cannot be identified by PASI alone while initiating biologics or switching from other biologics in clinical practice. (C) 2021 The Authors. Published by Elsevier B.V. on behalf of Japanese Society for Investigative Dermatology.