Specific studies on apremilast for nail psoriasis are lacking. Our objective was to evaluate the nail-specific patient-reported outcomes, clinical efficacy, ultrasound (US) parameters, and safety of apremilast for nail psoriasis. We conducted a prospective cohort study including adult patients with plaque and nail psoriasis with a fingernail Nail Psoriasis Severity Index (NAPSI) score of 12 or more. Patients were treated with apremilast 30 mg b.i.d. for 52 weeks. Forty-five patients were included. At week 52, the Nail Assessment in Psoriasis and Psoriatic Arthritis (NAPPA) Patient Benefit Index global weighted score was 2 or more in 52% of patients and NAPPA Quality of Life and fingernail NAPSI improved by 57% and 53%, respectively. US parameters improved from week 16 onwards. Target nail NAPSI improvements were higher for nail matrix scores (60%) than for nail bed scores (38%, p < 0.001). Baseline target nail bed NAPSI was associated with not achieving a target nail 50% reduction in NAPSI score at week 52 in the bivariate analysis (p = 0.024). Safety was consistent with the known apremilast profile. Results from apremilast therapy for 52 weeks in patients with psoriasis and predominant nail disease show significant improvements in nail-specific quality of life, clinical signs, and structural restoration on US, suggesting that apremilast may be considered in the treatment of nail psoriasis.
Keywords: NAPPA; apremilast; nail psoriasis; patient-reported outcomes; ultrasonography.
© 2021 Japanese Dermatological Association.