Positive results have been demonstrated in two phase III trials (PRECiSE 1 and 2) of certolizumab pegol versus placebo in moderate to severe active Crohn's disease.citation needed In addition, data from both trials suggest it is well-tolerated. As yet its efficacy has not been directly compared to other anti-TNF-α agents.citation needed
Preliminary results of the RAPID 1 &a 2 phase III studies were also reportedly positive.[3][4]
^ Sandborn WJ, Feagan BG, Stoinov S, et al (2007). "Certolizumab pegol for the treatment of Crohn's disease". N. Engl. J. Med.357 (3): 228–38. doi:10.1056/NEJMoa067594. PMID 17634458.
^ Keystone E, Mason D, Combe B. The anti-TNF certolizumab pegol in combination with methotrexate is significantly more effective than methotrexate alone in the treatment of patients with active rheumatoid arthritis: preliminary results from the RAPID 1 study. Ann Rheum Dis 2007;66(Suppl II):55 Presented at: EULAR 2007 Meeting; June 13-16, 2007; Barcelona, Spain. Abstract OP0016