Pegfilgrastim Enhances the Antitumor Effect of Therapeutic Monoclonal Antibodies
Published OnlineFirst March 17, 2016; DOI: 10.1158/1535-7163.MCT-15-0759 Small Molecule Therapeutics Molecular Cancer Therapeutics Pegfilgrastim Enhances the Antitumor Effect of Therapeutic Monoclonal Antibodies Sebastien Cornet1,2,3,4, Doriane Mathe2,3,4, Kamel Chettab1,2,3,4, Anne Evesque2,3,4, Eva-Laure Matera2,3,4, Olivier Tredan 5, and Charles Dumontet1,2,3,4 Abstract Therapeutic mAbs exert antitumor activity through various filgrastim in murine xenograft models treated with mAbs. This þ mechanisms, including apoptotic signalization, complement- was observed with rituximab in CD20 models and with trastu- þ dependent cytotoxicity, and antibody-dependent cellular cyto- zumab in HER2 models. Stimulation with pegfilgrastim was toxicity (ADCC) or phagocytosis (ADCP). G-CSF and GM-CSF associated with significant enhancement of leukocyte content have been reported to increase the activity of antibodies in in spleen as well as mobilization of activated monocytes/ preclinical models and in clinical trials. To determine the poten- granulocytes from the spleen to the tumor bed. These results tial role of pegfilgrastim as an enhancer of anticancer antibodies, suggest that pegfilgrastim could constitute a potent adjuvant for we performed a comparative study of filgrastim and pegfilgrastim. immunotherapy with mAbs possessing ADCC/ADCP properties. We found that pegfilgrastim was significantly more potent than Mol Cancer Ther; 15(6); 1238–47. Ó2016 AACR. Introduction Most clinically used mAbs belong to the IgG subclass and their Fc domain interacts with IgG Fc receptors (Fcg receptors). The mAbs are increasingly used for the treatment of cancer patients. human IgG receptor family includes several members, most of Their mechanisms of action are complex as antibodies can either which are activating (CD64 or FcgRI, CD32a or FcgRIIa, CD16a or target the tumor cells themselves or the microenvironment, FcgRIIIa, CD16b or FcgRIIIb) and one which is inhibitory including tumor vasculature or the surrounding immune cells.
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