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Fc Effector Function Contributes to the Activity of Human Anti-CTLA-4 Antibodies

Abstract

With the use of a mouse model expressing human Fc-gamma receptors (FcγRs), we demonstrated that antibodies with isotypes equivalent to ipilimumab and tremelimumab mediate intra-tumoral regulatory T (Treg) cell depletion in vivo, increasing the CD8 to Treg cell ratio and promoting tumor rejection. Antibodies with improved FcγR binding profiles drove superior anti-tumor responses and survival. In patients with advanced melanoma, response to ipilimumab was associated with the CD16a-V158F high affinity polymorphism. Such activity only appeared relevant in the context of inflamed tumors, explaining the modest response rates observed in the clinical setting. Our data suggest that the activity of anti-CTLA-4 in inflamed tumors may be improved through enhancement of FcγR binding, whereas poorly infiltrated tumors will likely require combination approaches.

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References
1.
Snyder A, Makarov V, Merghoub T, Yuan J, Zaretsky J, Desrichard A . Genetic basis for clinical response to CTLA-4 blockade in melanoma. N Engl J Med. 2014; 371(23):2189-2199. PMC: 4315319. DOI: 10.1056/NEJMoa1406498. View

2.
Koene H, Kleijer M, Algra J, Roos D, von dem Borne A, de Haas M . Fc gammaRIIIa-158V/F polymorphism influences the binding of IgG by natural killer cell Fc gammaRIIIa, independently of the Fc gammaRIIIa-48L/R/H phenotype. Blood. 1997; 90(3):1109-14. View

3.
Weng W, Levy R . Two immunoglobulin G fragment C receptor polymorphisms independently predict response to rituximab in patients with follicular lymphoma. J Clin Oncol. 2003; 21(21):3940-7. DOI: 10.1200/JCO.2003.05.013. View

4.
Robert C, Ribas A, Wolchok J, Hodi F, Hamid O, Kefford R . Anti-programmed-death-receptor-1 treatment with pembrolizumab in ipilimumab-refractory advanced melanoma: a randomised dose-comparison cohort of a phase 1 trial. Lancet. 2014; 384(9948):1109-17. DOI: 10.1016/S0140-6736(14)60958-2. View

5.
Musolino A, Naldi N, Bortesi B, Pezzuolo D, Capelletti M, Missale G . Immunoglobulin G fragment C receptor polymorphisms and clinical efficacy of trastuzumab-based therapy in patients with HER-2/neu-positive metastatic breast cancer. J Clin Oncol. 2008; 26(11):1789-96. DOI: 10.1200/JCO.2007.14.8957. View