The quality of evidence is downgraded by study quality.
A Cochrane review [Abstract] 1 included 60 studies with a total of 5469 subjects, mostly adults. The duration of treatment was generally up to four months. Eighteen trials studied topical corticosteroids or calcineurin inhibitors; 10 studies, phototherapy; three studies, systemic immunosuppressives; and five studies, oral retinoids. Most studies compared an active intervention against no treatment, variants of the same medication, or placebo (or vehicle).
Corticosteroid creams/ointments: When assessed 15 days after the start of treatment, clobetasol propionate 0.05% foam probably improved participant-rated control of symptoms compared to vehicle (RR 2.32, 95% CI 1.38 to 3.91; NNTB 3, 95% 1 study, 125 participants). The effect of clobetasol compared to vehicle for investigator-rated improvement was less clear (RR 1.43, 95% CI 0.86 to 2.40). More participants had at least one adverse event with clobetasol (11/62 versus 5/63; RR 2.24, 95% CI 0.82 to 6.06), including application site burning/pruritus. When assessed 36 weeks after the start of treatment, mometasone furoate cream used thrice weekly may slightly have improved investigator-rated symptom control compared to twice weekly (RR 1.23, 95% CI 0.94 to 1.61; 1 study, 72 participants) after remission was reached. Some mild atrophy was reported in both groups (RR 1.76, 95% CI 0.45 to 6.83; 5/35 versus 3/37).
Irradiation with ultraviolet (UV) light: Local combination ultraviolet light therapy (PUVA) may lead to improvement in investigator-rated symptom control when compared to local narrow-band UVB after 12 weeks of treatment (RR 0.50, 95% CI 0.22 to 1.16; 1 study, 60 participants). However, the 95% CI indicates that PUVA might make little or no difference. Adverse events (mainly erythema) were reported by 9/30 participants in the narrow-band UVB group versus none in the PUVA group.
Topical calcineurin inhibitors:tacrolimus 0.1% over two weeks probably improved investigator-rated symptom control measured after three weeks compared to vehicle (14/14 tacrolimus versus 0/14 vehicle; 1 study). Four of 14 people in the tacrolimus group versus zero in the vehicle group had well-tolerated application site burning/itching.A within-participant study in 16 participants compared 0.1% tacrolimus to 0.1% mometasone furoate but did not measure investigator- or participant-rated symptoms. Both treatments were well tolerated when assessed at two weeks during four weeks of treatment.
Oral interventions:
Oral cyclosporin 3 mg/kg/d probably slightly improved investigator-rated (RR 1.88, 95% CI 0.88 to 3.99; 1 study, 34 participants) or participant-rated (RR 1.25, 95% CI 0.69 to 2.27) control of symptoms compared to topical betamethasone dipropionate 0.05% after six weeks of treatment. The risk of adverse events such as dizziness was similar between groups (up to 36 weeks; RR 1.22, 95% CI 0.80 to 1.86, n = 55; 15/27 betamethasone versus 19/28 cyclosporin).
Alitretinoin 10 mg improved investigator-rated symptom control compared with placebo (RR 1.58, 95% CI 1.20 to 2.07; NNTB 11, 95% CI 6.3 to 26.5; 2 studies, n = 781) and alitretinoin 30 mg also improved this outcome compared with placebo (RR 2.75, 95% CI 2.20 to 3.43; NNTB 4, 95% CI 3 to 5; 2 studies, n = 1210). Similar results were found for participant-rated symptom control: alitretinoin 10 mg RR 1.73 (95% CI 1.25 to 2.40) and 30 mg RR 2.75 (95% CI 2.18 to 3.48). The number of adverse events (including headache) probably did not differ between alitretinoin 10 mg and placebo (RR 1.01, 95% CI 0.66 to 1.55; 1 study, n = 158; moderate-certainty evidence), but the risk of headache increased with alitretinoin 30 mg (RR 3.43, 95% CI 2.45 to 4.81; 2 studies, n = 1210; high-certainty evidence). Outcomes were assessed between 48 and 72 weeks.
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