Health-Related Quality of Life Worsens Disproportionately to Objective Signs of Psoriasis After Withdrawal of Adalimumab Therapy

INTRODUCTION Health-related quality of life (HRQoL) is an important part of the clinical assessment and management of psoriasis. Few studies have investigated the effects of withdrawing treatment on the relationship between HRQoL and objective clinical manifestations of psoriasis. This post hoc subanalysis of a clinical trial (REVEAL) examined the relationship of HRQoL [assessed with the Dermatology Life Quality Index (DLQI)] and objective disease activity [assessed with the Psoriasis Area and Severity Index (PASI)] among patients before and after they underwent protocol-mandated discontinuation of psoriasis therapy. METHODS Adult patients with moderate-to-severe plaque psoriasis who received adalimumab from baseline and had 75% or greater improvement in the PASI score at weeks 16 and 33 were re-randomized to adalimumab 40 mg or placebo every other week from weeks 33 to 52. DLQI and PASI scores were compared at baseline (week 0), early in treatment (week 4), directly before randomized withdrawal (week 33), and up to 19 weeks after treatment discontinuation (week 52; last observations carried forward). Correlations between DLQI total score and PASI score at week 4 and week 52 were modeled by linear regression. RESULTS In the patients (N = 240) who underwent protocol-mandated discontinuation of psoriasis treatment after achieving PASI 75 response, mean PASI scores at week 52 were lower (i.e., better) compared with week 4, yet mean DLQI scores were higher (i.e., worse). An approximately twofold disproportionately greater degree of worsening of DLQI score compared with the degree of worsening of PASI was observed while patients underwent discontinuation of therapy (week 52) compared with early in treatment (week 4). There was a significant interaction (P < 0.0001) between the PASI-DLQI correlation and study period (week 4 or 52). CONCLUSION Discontinuing therapy in patients who initially responded to treatment, as seen in this analysis with adalimumab, disproportionately worsened patient-reported HRQoL relative to the worsening of PASI.