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We read with interest the study by Colombel et al1 on vedolizumab (VDZ) safety in Crohn's disease (CD) and ulcerative colitis (UC). These data were derived from pivotal clinical trials which naturally exclude pregnant women, leaving this important area of pharmacovigilance unaddressed. Epidemiologically, the first age peak of IBD frequently overlaps with family planning. Thus, there is considerable interest among couples and healthcare providers on how VDZ impacts on pregnant women and newborns. Here we report the first four fully VDZ exposed and documented pregnancies and newborns.
VDZ (MLN0002, MLN02, LDP-02, anti-α4β7) is a humanised monoclonal IgG1 antibody targeting α4β7 integrin. IgG1 is the predominant means of fetal immunity and maternal–fetal transport across the placenta, which increases linearly throughout pregnancy.2 Therefore, it can …
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