A Psoriasis Plaque Test Comparing Eight Different Formulations of Vitamin D Analogues for the Treatment of Psoriasis

Inclusion criteria

• Subjects having understood and signed an informed consent form.
• Either sex
• Age 18 years or above
• All skin types and any ethnic origin
• Subjects with a diagnosis of psoriasis vulgaris with lesions located on arms, legs or trunk.

Exclusion criteria

• Females who are pregnant, or who wish to become pregnant during the study, or who are breast feeding
• Systemic treatment with biological therapies (marketed or not marketed) with a possible effect on psoriasis vulgaris within 4 weeks (etanercept), 2 months (adalimumab, alefacept, infliximab), 4 months (ustekinumab) or 4 weeks/5 half-lives (which-ever is longer) for experimental biological products prior to randomisation
• Systemic treatments with all other therapies than biologicals, with a potential effect on psoriasis vulgaris (e.g., corticosteroids, vitamin D analogues, retinoids, immuno-suppressants) within the 4-week period prior to randomisation
• Subjects using one of the following topical drugs for the treatment of psoriasis within the 4 week period prior to randomisation and during the study:

• Potent or very potent (WHO group III-IV) corticosteroids
• PUVA or Grenz ray therapy
• Subjects using one of the following topical drugs for the treatment of psoriasis within two weeks prior to randomisation and during the study:

• WHO group I-II corticosteroids (except if used for treatment of scalp psoriasis)
• Topical retinoids
• Vitamin D analogues
• Topical immunomodulators (e.g. macrolides)
• Anthracen derivatives
• Tar
• Salicylic acid
• UVB therapy
• Subjects known to be non-responder to topical vitamin D analogues (e.g., known history of no improvement or worsening of psoriasis with e.g., calcipotriol, calcitriol or tacalcitol when used according to current SmPc)
• Subjects who have received treatment with any non-marketed drug substance (i.e., an agent which has not yet been made available for clinical use following registration) within the 4 week period prior to randomisation or longer, if the class of the substance requires a longer washout as defined above (e.g., biological treatments)
• Subjects with current participation in any other interventional clinical, based on interview of the subject
• Subjects with current diagnosis of guttate, erythrodermic, exfoliative or pustular psoriasis
• Subjects with known or suspected hypersensitivity to component(s) of the investigational products
• Subjects with known/suspected disorders of calcium metabolism associated with hypercalcaemia
• Subjects with known severe hepatic and/or severe renal insufficiency
• Subjects with any concomitant medical or dermatological disorder(s) which might preclude accurate evaluation of the psoriasis