Psoriasis Vulgaris Clinical Trial
Official title:
Evaluation of the Predictive Value of Early Serum Trough Concentrations and Anti-drug Antibodies of Ixekizumab and the Development of Concentration-response Curve of Ixekizumab for Psoriasis Patients
Biologics, such as ixekizumab, are currently the most effective treatment option for patients with moderate-to-severe psoriasis. But they are costly for health care systems and prescribed according to a 'one dose fits all' dosing regimen, leading to potential over- and undertreatment. Within this study the investigators aim to investigate the predictive value of early serum trough levels of ixekizumab and determine the therapeutic window of ixekizumab in psoriasis patients.
Patients will be included after siging informed consent. After inclusion, patients will continue on standard dosing schedule of ixekizumab (i.e. one loading dose of 2 subcutaneous injections (160 mg) at week 0, followed by one subcutaneous injection (80 mg) every 2 weeks for 12 weeks, and then one subcutaneous injections (80 mg) every 4 weeks). During each study visit, blood will be taken in order to quantify Ctroughs and/or anti-drug antibodies towards ixekizumab. In addition, the Psoriasis Severity and Area Index (PASI) and the Investigator's Global Assessment (IGA) score will be evaluated by a physician. Patients complete the Dermatology Life Quality Index (DLQI) and European quality of life EQ-5D instrument at each visit. ;
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