Ankylosing Spondylitis Clinical Trial
Official title:
Effects of NSAIDs on RAdiographic Damage in Ankylosing Spondylitis (ENRADAS) - a Prospective Randomised Controlled Trial
This is a randomised, controlled, multi-centre clinical trial on AS patients. Experimental intervention: continuous (daily) treatment with diclofenac cholestyramine 150 mg (Voltaren Resinate), divided into 75mg Voltaren twice dailyControl intervention: treatment on-demand (as needed) with diclofenac-cholestyramine 75 to 150 mg (Voltaren Resinate). The treatment strategy of the control intervention (on-demand) reflects current clinical practice in AS. Duration of intervention per patient: 2 years Follow-up per patient: safety assessment 3 months after termination of the trial.
Ankylosing spondylitis (AS) is a common chronic inflammatory rheumatic disease with a prevalence of about 0.5%. First symptoms normally occur in young adulthood. Early in its course, AS is dominated by chronic pain, fatigue and morning stiffness, later on by ankylosis and loss of function. Nonsteroidal anti-inflammatory drugs (NSAID) and tumor necrosis factor (TNF) alpha blocking agents are the only drugs with proven efficacy for signs and symptoms. It is not clear, however, whether these drugs are also capable of retarding or stopping structural damage, i.e. prevention of bony ankylosis. Earlier investigations indicated that NSAIDs have, in addition to their anti-inflammatory, also an anti-osteoproliferative effect. In this study we will investigate whether treatment with 150 mg diclofenac, a non-selective NSAID, on a daily basis (continuous treatment) over 2 years is capable to slow down the development of bony ankylosis as compared to treatment with 75-150mg diclofenac as needed according to clinical symptoms (on-demand treatment). In this national multi-centre randomized trial patients with symptomatic AS and indication for NSAID therapy will be enrolled in about 40 centres. The primary outcome parameter is the proportion of patients with radiographic progression in the spine after 2 years in each treatment arm. If continuous NSAID treatment results in less radiographic progression as compared to on-demand treatment, a true disease modifying effect of NSAID has to be assumed which will most likely change the place of NSAID treatment in AS. ;
Allocation: Randomized, Endpoint Classification: Safety/Efficacy Study, Intervention Model: Parallel Assignment, Masking: Open Label, Primary Purpose: Treatment
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