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Adalimumab significantly reduces inflammation and serum DKK-1 level but increases fatty deposition in lumbar spine in active ankylosing spondylitis
International Journal of Rheumatic Diseases,  Clinical Article

Hu Z et al. – The study found that adalimumab was highly effective in reducing inflammation in active ankylosing spondylitis (AS) patients, but it was accompanied by the formation of fatty deposition lesions (FDL) in the lumbar spine and decrease in serum Dickkopf homolog 1 (Dkk–1) levels.

Methods
  • This was a randomized, double–blind, placebo–controlled study.
  • Active AS patients received 40 mg adalimumab (n = 26) or placebo (n = 20) every other week during an initial 12–week double–blind period, and all switched to adalimumab treatment for another 12 weeks.
  • Bath Ankylosing Spondylitis Disease Activity Index (BASDAI), Bath Ankylosing Spondylitis Function Index (BASFI), C–reactive protein (CRP), Ankylosing Spondylitis Disease Activity Scores (ASDAS) and serum DKK–1 levels were measured and magnetic resonance imaging (MRI) of both the lumbar spine and sacroiliac joints were obtained at baseline, week 12 and week 24.
  • Spinal and sacroiliac joint inflammations were evaluated using the Spondyloarthritis Research Consortium of Canada (SPARCC) MRI index, and FDL were assessed in a dichotomous manner.

Results
  • Obvious improvements in clinical assessments (BASDAI, BASFI, CRP and ASDAS reduced, all P < 0.05), as well as MRI inflammation measurements (both lumbar spine and sacroiliac joints SPARCC scores decreased, all P < 0.05) were shown in active AS patients treated by adalimumab for 12 weeks, but FDL in the lumbar spine seen by MRI increased significantly (P < 0.05) accompanied by decrease of serum DKK–1 levels (P < 0.05), while FDL remained stable after the treatment of placebo in AS patients.

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