infusion of infliximab will induce endoscopic and clinical remission in the 60% of patients with Crohn's disease that is unresponsive to azathioprine and steroids. In patients with fistulising or treatment-resistant Crohn's disease, infliximab increases remission rates and response rates
a systematic review concerning the use of infliximab in ulcerative colitis found that (2):
infliximab was more effective than placebo, with an NNT from 3 to 5, for the treatment of moderate-to-severe UC, that achieved clinical remission in 40% of the patients at approximately 9 months of follow-up
NICE have stated that:
infliximab, adalimumab and golimumab are recommended as options for treating moderately to severely active ulcerative colitis in adults whose disease has responded inadequately to conventional therapy including corticosteroids and mercaptopurine or azathioprine, or who cannot tolerate, or have medical contraindications for, such therapies
infliximab is recommended as an option for treating severely active ulcerative colitis in children and young people aged 6-17 years whose disease has responded inadequately to conventional therapy including corticosteroids and mercaptopurine or azathioprine, or who cannot tolerate, or have medical contraindications for, such therapies
infliximab, adalimumab or golimumab should be given as a planned course of treatment until treatment fails (including the need for surgery) or until 12 months after starting treatment, whichever is shorter
should continue treatment only if there is clear evidence of response as determined by clinical symptoms, biological markers and investigation, including endoscopy if necessary
should consider a trial withdrawal from treatment for all patients who are in stable clinical remission. People whose disease relapses after treatment is stopped should have the option to start treatment again
Reference
Infliximab (review) and adalimumab for the treatment of Crohn's disease; NICE Technology Appraisal Guidance, May 2010
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