Long-term MRI-guided combined anti-TNF-α and thiopurine therapy for crohn's perianal fistulas
Inflammatory Bowel Disease,  Clinical Article

Tozer P et al. – Combination anti–tumor necrosis factor (TNF) and thiopurine therapy provides sustained benefit in patients with perianal Crohn's disease (CD) fistula. Early clinical response is associated with subsequent clinical remission. Radiological healing is slower than clinical healing. Radiologically healed fistula tracts maintain healing on infliximab but can recur after cessation of therapy.

Methods
  • Consecutive patients with CD-related perianal (anal, rectovaginal, anolabial) fistulas treated with infliximab or adalimumab were monitored prospectively both clinically and radiologically using magnetic resonance imaging (MRI).

Results
  • Forty-one consecutive patients with CD-related perianal fistulas were treated with infliximab (n=32) or adalimumab (n=9; following infliximab failure) in combination with a thiopurine (unless intolerant).
  • Fifty-eight percent of all patients, comprising 66% and 43% of infliximab and adalimumab-treated patients, respectively, demonstrated remission or response at 3 years.
  • Thirty-three percent of infliximab treated patients maintained clinical remission at 3 years.
  • Radiological healing lagged behind clinical remission by a median of 12 months.
  • The likelihood of clinical remission at any time was five times greater in patients who had early clinical response within 6 weeks than those without.
  • A higher number of fistula tracts was associated with reduced clinical remission.
  • All patients who achieved radiological healing maintained healing on infliximab treatment, while only 43% maintained healing after cessation of anti-TNF therapy.

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