Tumor cell agglutination and not solely cytokine release as mechanism of adverse reactions during anti-CD20 monoclonal antibody (IDEC-C2B8, rituximab) treatment.

The chimeric monoclonal anti-CD20 antibody has been widely used for the treatment of relapsed or refractory low-grade B-cell non-Hodgkin lymphoma (NHL). However, in patients with a high number of tumor cells in blood, severe infusion-related toxicities have been reported.[1][1] On the basis of