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Systemic Combination Treatment for Psoriasis: a Review Acta Derm Venereol 2010; 90: 341–349 REVIEW ARTICLE Systemic Combination Treatment for Psoriasis: A Review Peter JENSEN, Lone SKOV and Claus ZACHARIAE Department of Dermato-Allergology, Copenhagen University Hospital Gentofte, Denmark Psoriasis is a chronic inflammatory skin disease, systemic anti-psoriatic combination regimens, to pro- which affects approximately 2.6% of the population in vide a readily available summary of studies, in which Northern Europe and Scandinavia. To achieve disease systemic treatments were combined. control, combinations of systemic treatments are so- metimes needed for variable time periods. However, no evidence-based guidelines exist for the use of systemic MateRIALS AND METHODS combination therapy. Therefore, the aim was to review We searched PubMed up to 31 October 2009 to identify all the current literature on systemic anti-psoriatic combi- retrospective and prospective studies, including case reports nation regimens. We searched PubMed, and identified published in English in which patients with psoriasis received systemic combination treatment. The search string consisted 98 papers describing 116 studies (23 randomized) that of the following free-text terms: “psoriasis”, “combined”, reported on the effect of various systemic combination “combination”, “concurrent”, and “concomitant”. The Cochrane treatments. The most thoroughly investigated combina- Controlled Trials Register was searched using the free-text tion was retinoid and phototherapy. Further controlled term “psoriasis” and no related Cochrane Systematic Review research is needed to define the safest and most effective exists. In addition, a search using the Medical Subject Heading “psoriasis” revealed no relevant studies. Review articles and combination regimens. Key words: psoriasis; systemic articles cited in original papers allowed us to identify addi- treatment; combination treatment. tional studies. Articles without information on the efficacy of treatment and studies reporting on the effect of sequential and (Accepted April 15, 2010.) rotational therapy, were excluded. No studies were excluded because of inadequate study design. Studies reporting on the Acta Derm Venereol 2010; 90: 341–349. effect on psoriatic arthritis as a primary endpoint were included if information about the effect on the cutaneous manifestations Peter Jensen, Department of Dermato-Allergology, Co- was provided. Combinations involving phototherapy (psoralen penhagen University Hospital Gentofte, Niels Andersens plus ultraviolet A (PUVA), narrowband UVB (NB-UVB) and Vej 65, DK-2900 Hellerup, Denmark. E-mail: peterj01@ broadband UVB (UVB)) were also included. This search re- geh.regionh.dk vealed 98 papers describing 116 retro- and prospective studies, of which 23 were randomized. The studies were sorted into five main groups as follows: (1) methotrexate (MTX) combinations, (2) retinoid combinations, Psoriasis is a chronic inflammatory skin disease with an (3) cyclosporine combinations, (4) biological combinations, estimated global prevalence ranging from 0.5% to 4.6% and (5) other systemic combinations. Within each of these five (1), and it affects approximately 2.6% of the population main groups, studies were subdivided according to which medi- in Northern Europe and Scandinavia (2). cation the “main” agent was combined with (Fig. 1). In these Psoriasis vulgaris, the most common form, accounts subgroups, study design, number of patients, treatment regimen and efficacy is shown either in Table I (randomized studies) for more than 80% of psoriasis cases (1). Most patients or in supplementary Table SII (available from http://adv.medi- are mildly affected and can be treated adequately caljournals.se/article/abstract/10.2340.00015555-0905/Tab2) with topical medication, but 10–20% of patients have (non-randomized studies). In many cases no clearly defined moderate-to-severe disease and require phototherapy or objectively determined inclusion criteria were stated, but or systemic treatment. Frequently, however, this does we assume that the patients had moderate-to-severe psoriasis since combination therapy was initiated. Furthermore, objec- not result in adequate disease clearance, and there- tive assessment, such as Psoriasis Area Severity Index (PASI) fore systemic treatments are sometimes combined score, was frequently missing and instead we listed investigator for variable time periods to achieve an additive or comments on the effect of treatment. Some studies report on synergistic effect. Dosages of the individual agents several different combinations and may therefore appear in may then be reduced to minimize side effects. Also, more than one group. in patients with moderate-to-severe psoriasis, combi- nation therapy is often administered for shorter time RESULTS periods while mono therapy is changed from one drug to another. Combination therapies with methotrexate No evidence-based guidelines exist for the use of systemic combination treatment. The purpose of this We identified 20 studies in which MTX was given in study was therefore to review the current literature on combination with another systemic drug. Six studies © 2010 The Authors. doi: 10.2340/00015555-0905 Acta Derm Venereol 90 Journal Compilation © 2010 Acta Dermato-Venereologica. ISSN 0001-5555 342 P. Jensen et al. 116 studies (23 randomized) MTX and: Retinoid and: Cyclosporine and: Biologics and: Other systemic Cyclosporine (6) Phototherapy (25) PUVA (2) MTX (15) combinations (7) Fig. 1. Number of studies in each Phototherapy (6) Other (4) Retinoid (5) Phototherapy (10) of the five main groups. MTX: Other (2) Retinoid (10) Retinoids (7) methotrexate; PUVA: psoralen plus Betamethasone (1) Cyclosporine (6) Other (10) ultraviolet A. (124 patients) reported on the effect of combining MTX Combination therapies with retinoids with cyclosporine (3–8). The study by Fraser et al. (3) (Table I) randomized patients with psoriatic arthritis Twenty-nine studies included retinoids in combination and psoriasis to receive either MTX and placebo or with another systemic treatment. Twenty-six of these MTX and cyclosporine. The study showed a statistically studies (1205 patients) examined the effect of combi- significant difference between groups on PASI and ning retinoids with phototherapy (24–49). In the seven psoriatic arthritis in favour of combination therapy. In randomized studies (Table I) patients were generally the five remaining uncontrolled studies (Table SII) a allocated to receive either PUVA and placebo or reti- beneficial effect of combining MTX with cyclosporine noid and PUVA. These controlled data show that the was reported, apart from one case series of four patients combination of PUVA and retinoid usually achieved published by Korstanje et al. (7). In this report three disease clearance faster than placebo and PUVA or reti- out of four patients experienced worsening of their noid monotherapy, and that fewer UVA exposures were psoriasis, which occurred following a dose reduction needed in the groups that received UVA combined with of cyclosporine due to side effects. In addition, several a retinoid. There seemed to be no difference between studies have demonstrated effect and safety of combined etretinate and acitretin regarding efficacy. Ruzicka et al. treatment with MTX and cyclosporine in patients with (30) and Lowe et al. (31) (Table I) randomly allocated rheumatoid arthritis (9, 10). patients to receive either acitretin and UVB or placebo Six studies examined the effect of combining MTX and UVB, and also showed that combination therapy with phototherapy (125 patients) (11–16). A randomi- with UVB and retinoids had a significantly increased zed study by Asawanonda & Nateetongrungsak (11) effect on PASI. With regards to type of phototherapy, (Table I) showed a significantly better effect of com- Özdemir et al. (24) randomized patients to receive bined treatment with MTX and NB-UVB compared either acitretin and PUVA or acitretin and NB-UVB and with NB-UVB monotherapy. Similarly, Shehzad et al. concluded that both regimens were equally effective. (12) (Table I) demonstrated that patients randomized The large number of papers reporting on the retinoid to MTX and concomitant PUVA therapy achieved and phototherapy combination reflects the widespread clearance earlier than patients treated with either use of this combination. This is in accordance with the PUVA or MTX mono therapy. All studies, including general conception that this combination is a safe and four non-randomized reports (Table SII), support that effective treatment for moderate-to-severe psoriasis. an additive effect is achieved when combining MTX For the 18 non-randomized studies, see Table SII. and phototherapy, but the long-term risk of skin can- Retinoids were combined in various uncommon ways cer may be increased and this should be taken into in three studies (50–52). The study by Ezquerra et al. consideration. (50) (Table I) randomized patients to receive either MTX was combined with either acitretin or etretinate acitretin monotherapy or acitretin and per oral calcitriol in seven studies (25 patients) (16–22) (Table SII). No and demonstrated a significantly greater PASI reduction randomized data exist, and the available retrospective in the combination group. Mittal et al. (51) (Table I) data and case reports all show that MTX combined with randomly assigned patients to either acitretin and pla- retinoids led to disease clearance. It is noteworthy that cebo or acitretin and pioglitazone (anti-diabetic), and only 25
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