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.jpg): Failed to open stream: No such file or directory in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 117 Nat+Med
2016 ; 22
(12
): 1402-1410
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Eradication of large established tumors in mice by combination immunotherapy that
engages innate and adaptive immune responses
#MMPMID27775706
Moynihan KD
; Opel CF
; Szeto GL
; Tzeng A
; Zhu EF
; Engreitz JM
; Williams RT
; Rakhra K
; Zhang MH
; Rothschilds AM
; Kumari S
; Kelly RL
; Kwan BH
; Abraham W
; Hu K
; Mehta NK
; Kauke MJ
; Suh H
; Cochran JR
; Lauffenburger DA
; Wittrup KD
; Irvine DJ
Nat Med
2016[Dec]; 22
(12
): 1402-1410
PMID27775706
show ga
Checkpoint blockade with antibodies specific for cytotoxic T
lymphocyte-associated protein (CTLA)-4 or programmed cell death 1 (PDCD1; also
known as PD-1) elicits durable tumor regression in metastatic cancer, but these
dramatic responses are confined to a minority of patients. This suboptimal
outcome is probably due in part to the complex network of immunosuppressive
pathways present in advanced tumors, which are unlikely to be overcome by
intervention at a single signaling checkpoint. Here we describe a combination
immunotherapy that recruits a variety of innate and adaptive immune cells to
eliminate large tumor burdens in syngeneic tumor models and a genetically
engineered mouse model of melanoma; to our knowledge tumors of this size have not
previously been curable by treatments relying on endogenous immunity. Maximal
antitumor efficacy required four components: a tumor-antigen-targeting antibody,
a recombinant interleukin-2 with an extended half-life, anti-PD-1 and a powerful
T cell vaccine. Depletion experiments revealed that CD8(+) T cells,
cross-presenting dendritic cells and several other innate immune cell subsets
were required for tumor regression. Effective treatment induced infiltration of
immune cells and production of inflammatory cytokines in the tumor, enhanced
antibody-mediated tumor antigen uptake and promoted antigen spreading. These
results demonstrate the capacity of an elicited endogenous immune response to
destroy large, established tumors and elucidate essential characteristics of
combination immunotherapies that are capable of curing a majority of tumors in
experimental settings typically viewed as intractable.