Non-autoimmune combined factor XIII A and B subunit deficiencies in rheumatoid arthritis patients treated with anti-interleukin-6 receptor monoclonal antibody (tocilizumab)
文摘

An antibody to the IL-6 receptor (tocilizumab, TCZ) is an effective treatment for RA.

Two RA cases with acquired FXIII deficiency developed bleeding during TCZ treatment.

FXIII activity, FXIII-A, -B, and -A2B2 antigens were low in 36 TCZ-treated RA cases.

The low FXIII levels may result from their impaired synthesis caused by TCZ.

TCZ-treated patients may be at an elevated risk of bleeding because of low FXIII.

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