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B cell depletion therapy with rituximab (RTX; 2 weekly infusions of 1000 mg, premedication: 100 mg prednisolone) in primary Sjögren's syndrome (pSS) patients is effective in reducing subjective and objective symptoms.1 As B cell activating factor (BAFF) and a proliferation-inducing ligand (APRIL) are important cytokines involved in B cell survival and activation, we assessed in pSS patients included in a double-blind, randomised, placebo-controlled trial1 the effects of RTX on serum BAFF and APRIL levels up to 48 weeks after RTX.
Serum concentrations of BAFF and APRIL were measured by ELISA using kits from R&D systems (Minneapolis, Minnesota, USA) and Bender Med Systems (San Diego, California, USA), respectively. At baseline serum BAFF levels were significantly higher in pSS patients (n=28; median 1277 pg/ml (range 907–3802 pg/ml)) compared with healthy controls (n=10; median 983 pg/ml (range 600–1564 pg/ml)); p<0.01; figure 1A). Also, baseline serum APRIL levels were significantly higher in pSS patients (median 15 098 pg/ml (range 1891–228 591 pg/ml)) than in healthy controls (median 1965 pg/ml (range 889–4567 pg/ml); p<0.05; …
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