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Is rituximab sub-optimally dosed in indolent B cell lymphoma?
British Journal of Haematology 2016 September
Rituximab pharmacokinetics are affected by gender, age and weight and can affect outcomes in aggressive B cell lymphoma. Less is known about the pharmacokinetics of rituximab in indolent B cell lymphoma (iNHL). We analysed the effects of gender, age, weight and body surface area on the outcomes of 303 patients treated with first line rituximab-based regimens for iNHL. The patients were divided into 3 treatment cohorts: rituximab only, rituximab + chemotherapy (R-CTX) and R-CTX followed by rituximab maintenance; furthermore, each cohort was subdivided as follicular (FL) or non-FL, based on histology. Older males and patients with higher weight had worse outcomes when treated with R-CTX, probably due to faster rituximab clearance. Our results concur with studies of R-CTX for DLBCL. As this effect was not observed in patients treated with rituximab alone or R-CTX followed by rituximab maintenance, we hypothesize that higher rituximab levels reached with weekly rituximab and/or prolonged exposure achieved with maintenance therapy exceed the therapeutic threshold, even with faster clearance, which nullifies the negative effect of higher weight and male gender. In conclusion, under current practices, a subset of patients with iNHL, i.e., FL treated with R-CTX, may be sub-optimally dosed with rituximab.
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