Dosage adjustment during long-term adalimumab treatment for Crohn's disease: Clinical efficacy and pharmacoeconomics

Authors


  • The CHARM study was supported by Abbott Laboratories, Abbott Park, IL. Financial disclosures: W.J.S. served as study investigator and consultant for Abbott Laboratories and has participated in continuing medical education events supported by unrestricted educational grants from Abbott; received research support and consultant fees from Centocor, Inc., Elan Pharmaceuticals, Schering-Plough, and UCB. J.F.C. received consulting fees and research support from Abbott. S.S. served as study investigator and consultant for Abbott and has participated in continuing medical education events supported by unrestricted educational grants from Abbott; and served as consultant for Centocor, Inc., Schering-Plough, and UCB. S.E.P. received research support from Abbott and Centocor, Inc.; consulting fees from Abbott, Centocor, Inc., Elan Pharmaceuticals, Johnson & Johnson, Schering-Plough, and UCB; and honoraria (speaker) from Abbott, Centocor, Inc., Elan Pharmaceuticals, Mitsubishi Tanabe, and UCB. P.F.P., A.M.R., J.C., and P.M. are employees of Abbott Laboratories.

Abstract

Background:

Data from CHARM, a 56-week, randomized controlled trial of adalimumab for patients with moderately to severely active Crohn's disease (CD), were used to evaluate outcomes of adalimumab dosage adjustment.

Methods:

Patients randomized to blinded adalimumab 40 mg every other week (EOW) in CHARM were the focus of the analysis. At ≥12 weeks, patients with flares or lack of response versus baseline (including patients who responded and then lost response) could move sequentially to open-label (OL) adalimumab EOW and then to OL adalimumab weekly.

Results:

Of 260 patients randomized to adalimumab EOW, 140 (54%) continued blinded EOW therapy and 120 (46%) moved to OL therapy. Of patients on OL therapy, 49 (19%) continued EOW therapy and 71 (27%) moved to weekly therapy; 36 (14%) completed the trial on weekly therapy. Of 71 patients on weekly therapy, 37% achieved clinical remission (Crohn's Disease Activity Index [CDAI] <150), 58% achieved CR-100 (CDAI decreased ≥100 points), and 63% achieved CR-70 (CDAI decreased ≥70 points). Of the 49 patients who remained on OL EOW therapy, 39% achieved clinical remission, 59% achieved CR-100, and 63% achieved CR-70. In a logistic regression, greater baseline CDAI predicted changing to weekly therapy. A model of dosage-adjustment cost indicated a modest per-patient drug-acquisition cost increase ($574 over yearly EOW dosing cost [$22,518]).

Conclusions:

Of patients randomized to blinded EOW therapy, 19% moved to OL EOW therapy and 27% moved to OL weekly therapy for flares or lack of response versus baseline. Weekly therapy was associated with clear clinical benefits and a small cost increase. (Inflamm Bowel Dis 2011;)

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