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Clowse et al 1 have reported minimal to no transfer of certolizumab pegol (CZP) into breast milk, and their findings have supported the continuation of CZP treatment during breast milk feeding. Rheumatoid arthritis (RA) often develops in women of childbearing age. It is generally difficult to treat these patients with methotrexate, which is the anchor drug for RA. Therefore, biologics, such as tumour necrosis factor (TNF) inhibitors, are often considered for active RA during pregnancy. However, the biologics cross the placenta from mother to fetus and transfer into breast milk during lactation. Although a meta-analysis report indicated that anti-TNF-α therapy did not increase the risks, such as congenital malformation or abortion during pregnancy, in patients with inflammatory …
Competing interests None declared.
Patient consent Obtained.
Ethics approval The ethics committee approval was obtained from our hospital’s ethics committee (Medical Center for Translational and Clinical Research) (authorisation code: 11122-2).
Provenance and peer review Not commissioned; internally peer reviewed.
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