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2015 ; 106
(8
): 945-50
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gab.com Text
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Immune checkpoint blockade opens an avenue of cancer immunotherapy with a potent
clinical efficacy
#MMPMID25981182
Adachi K
; Tamada K
Cancer Sci
2015[Aug]; 106
(8
): 945-50
PMID25981182
show ga
Recent progress in tumor immunology has revealed that tumors generate
immunologically restrained milieu during the process of their growth, which
facilitates the escape of tumors from host immune systems. Immune checkpoint
molecules, which transduce co-inhibitory signals to immuno-competent cells, are
one of the most important components conferring the immunosuppressive capacity in
the tumor microenvironment. Cytotoxic T-lymphocyte-associated protein 4 (CTLA-4)
and programmed cell death-1 (PD-1) are typical immune checkpoint molecules
intimately involved in the suppression of anti-tumor immunity. Antibodies against
those molecules have been developed, such as ipilimumab (anti-CTLA-4 antibody),
nivolumab and pembrolizumab (anti-PD-1 antibody), and have been approved by
regulatory agencies and used in some countries. Treatment with these antibodies
demonstrates previously unobserved clinical efficacies superior to the
conventional therapies. In this review, we first discuss the escape mechanisms of
cancer from host immune systems, and then focus on the recent advances in immune
checkpoint blockade therapy and on the new findings of related immune reactions,
aiming to provide a better understanding of the novel cancer immunotherapies.