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Psoriasis of the scalp is challenging to manage. The only approved oral tyrosine kinase 2 and phosphodiesterase 4 inhibitors for psoriasis are deucravacitinib and apremilast. The aim of this study was to explore their efficacy for scalp psoriasis utilizing data from randomized controlled trials.
We searched Medline, Scopus, Web of Science, CENTRAL, and ClinicalTrials.gov up to August 4, 2023. To determine risk of bias, the revised Risk of Bias assessment tool 2.0 was used. Inverse variance random effects meta-analyses were executed. Heterogeneity was assessed utilizing Q and I2 statistics. Pre-determined outcomes included the proportion of participants with cleared scalp skin (Scalp Physician\'s Global Assessment [ScPGA] of 0/1), mean change in Psoriasis Scalp Severity Index (PSSI), and mean improvement in Dermatology Life Quality Index (DLQI).
Ten RCTs fulfilled inclusion criteria. Both apremilast (RR = 2.41, 95% CI = 2.08-2.79, Tau2 = 0, I2 = 0) and deucravacitinib (RR = 3.86, 95% CI = 3.02-4.94, Tau2 = 0, I2 = 0) were more effective in inducing ScPGA of 0/1 at 16 weeks compared to placebo. Furthermore, deucravacitinib was more effective than apremilast (RR = 1.70, 95% CI = 1.44-2.00, Tau2 = 0, I2 = 0). An analysis could not be executed for the rest of the outcomes.
Apremilast and deucravacitinib are effective for scalp psoriasis. Deucravacitinib may be more efficient in clearing the scalp.

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BACKGROUND: This review\'s goals were to investigate apremilast\'s efficacy versus placebo in palmoplantar psoriasis (PP) and palmoplantar pustulosis (PPP), and apremilast\'s efficacy versus methotrexate in PP.
METHODS: A literature search was conducted in PubMed, clinicaltrials.gov, and Embase in July 2022. Publications investigating subjects with PP or PPP, treated with apremilast, which reported palmoplantar-specific outcomes were used. Exclusion criteria included cases of drug-induced PP/PPP, case studies, non-English texts, omission of palmoplantar-specific outcomes, and incomplete publications. Studies were assessed for risk of bias using Cochrane Review Manager application and CASP checklist. Primary endpoints were a 50% improvement of the Palmoplantar Psoriasis/Pustulosis Area and Severity Index (PPPASI 50) and improvement of the Palmoplantar Physician Global Assessment (PPPGA) to 0 or 1 in patients with baseline PPPGA ≥ 3.
RESULTS: Seventeen original studies including five placebo-controlled randomized clinical trials (RCTs), one phase II clinical trial, two randomized methotrexate comparative trials, six cohort studies, and three case series were analyzed, totaling 1117 participants. Meta-analysis of four placebo-controlled RCTs investigating PP found apremilast treatment to be superior to placebo in achieving a PPPGA of 0/1 (baseline PPPGA of ≥ 3) after 16 weeks of treatment (n = 244; OR = 2.69 [1.39-5.22]). Apremilast was superior to placebo in achieving PPPASI 50 at week 16 in the only placebo-controlled RCT of PPP (78.3 vs. 40.9%) [P = 0.0003]. Apremilast was comparable to methotrexate in achieving PPPASI 50 at week 16 in PP (59.5 vs. 64.3%; n = 84; [P = 0.65]). Non-randomized studies generally showed marked improvement in PPPASI, PPPGA, and DLQI scores following apremilast treatment.
CONCLUSIONS: Apremilast treatment in PP and PPP resulted in significant improvement in objective, palmoplantar-specific clinical parameters versus placebo, and comparable efficacy with methotrexate in PP. Limitations in interpreting these results include variations in palmoplantar-specific metrics used and risk of bias of included studies.

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