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Efficacy of bezlotoxumab based on timing of administration relative to start of antibacterial therapy for Clostridium difficile infection.
Journal of Antimicrobial Chemotherapy 2018 September 2
Background: The fully human monoclonal antibody bezlotoxumab binds Clostridioides (Clostridium) difficile toxin B and reduces recurrence rates in patients with C. difficile infection (CDI) receiving antibacterial treatment for a primary or recurrent episode.
Objectives: To investigate whether the timing of bezlotoxumab administration relative to the onset of antibacterial treatment affected clinical outcome in the Phase 3 trials MODIFY I (NCT01241552) and MODIFY II (NCT01513239).
Methods: Initial clinical cure and CDI recurrence rates of participants who received bezlotoxumab or placebo were summarized by timing of infusion relative to the start of antibacterial drug treatment for CDI: 0-2, 3-4 and ≥5 days after onset.
Results: Of 1554 total participants, 649 (41.8%), 469 (30.1%) and 436 (28.1%) received an infusion 0-2, 3-4 and ≥5 days after onset of antibacterial treatment for CDI, respectively. Regardless of timing of administration, there were no differences in initial clinical cure rates between participants receiving bezlotoxumab (range 77.8% to 81.4%) or placebo (77.8% to 81.7%). Bezlotoxumab efficacy was unaffected by timing of administration; rates of CDI recurrence were lower versus placebo in all subgroups (range 19.3% to 22.8% for bezlotoxumab and 31.7% to 35.8% for placebo). Timing of administration also had no effect on time to resolution of diarrhoea, which was achieved by the end of antibacterial treatment in ∼95% of participants in both bezlotoxumab and placebo groups.
Conclusions: Bezlotoxumab is effective in preventing CDI recurrence and can be administered at any time before ending antibacterial drug treatment.
Objectives: To investigate whether the timing of bezlotoxumab administration relative to the onset of antibacterial treatment affected clinical outcome in the Phase 3 trials MODIFY I (NCT01241552) and MODIFY II (NCT01513239).
Methods: Initial clinical cure and CDI recurrence rates of participants who received bezlotoxumab or placebo were summarized by timing of infusion relative to the start of antibacterial drug treatment for CDI: 0-2, 3-4 and ≥5 days after onset.
Results: Of 1554 total participants, 649 (41.8%), 469 (30.1%) and 436 (28.1%) received an infusion 0-2, 3-4 and ≥5 days after onset of antibacterial treatment for CDI, respectively. Regardless of timing of administration, there were no differences in initial clinical cure rates between participants receiving bezlotoxumab (range 77.8% to 81.4%) or placebo (77.8% to 81.7%). Bezlotoxumab efficacy was unaffected by timing of administration; rates of CDI recurrence were lower versus placebo in all subgroups (range 19.3% to 22.8% for bezlotoxumab and 31.7% to 35.8% for placebo). Timing of administration also had no effect on time to resolution of diarrhoea, which was achieved by the end of antibacterial treatment in ∼95% of participants in both bezlotoxumab and placebo groups.
Conclusions: Bezlotoxumab is effective in preventing CDI recurrence and can be administered at any time before ending antibacterial drug treatment.
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