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2018 ; 7
(5
): e1426519
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M7824, a novel bifunctional anti-PD-L1/TGF? Trap fusion protein, promotes
anti-tumor efficacy as monotherapy and in combination with vaccine
#MMPMID29721396
Knudson KM
; Hicks KC
; Luo X
; Chen JQ
; Schlom J
; Gameiro SR
Oncoimmunology
2018[]; 7
(5
): e1426519
PMID29721396
show ga
Tumors evade host immune surveillance through multiple mechanisms, including the
generation of a tumor microenvironment that suppresses immune effector function.
Secretion of TGF? and upregulation of immune checkpoint programmed cell death
ligand-1 (PD-L1) are two main contributors to immune evasion and tumor
progression. Here, we examined the efficacy of a first-in-class bifunctional
checkpoint inhibitor, the fusion protein M7824, comprising the extracellular
domain of human TGF?RII (TGF? Trap) linked to the C-terminus of human anti-PD-L1
heavy chain (?PD-L1). We demonstrate that M7824 reduces plasma TGF?1, binds to
PD-L1 in the tumor, and decreases TGF?-induced signaling in the tumor
microenvironment in mice. In murine breast and colon carcinoma models, M7824
decreased tumor burden and increased overall survival as compared to targeting
TGF? alone. M7824 treatment promoted CD8+ T cell and NK cell activation, and both
of these immune populations were required for optimal M7824-mediated tumor
control. M7824 was superior to TGF?- or ?PD-L1-targeted therapies when in
combination with a therapeutic cancer vaccine. These findings demonstrate the
value of using M7824 to simultaneously target TGF? and PD-L1/PD-1
immunosuppressive pathways to promote anti-tumor responses and efficacy. The
studies also support the potential clinical use of M7824 as a monotherapy or in
combination with other immunotherapies, such as therapeutic cancer vaccines,
including for patients who have progressed on ?PD-L1/?PD-1 checkpoint blockade
therapies.