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2014 ; 2
(2
): 163-194
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Tumor Restrictions to Oncolytic Virus
#MMPMID28548066
Vähä-Koskela M
; Hinkkanen A
Biomedicines
2014[Apr]; 2
(2
): 163-194
PMID28548066
show ga
Oncolytic virotherapy has advanced since the days of its conception but
therapeutic efficacy in the clinics does not seem to reach the same level as in
animal models. One reason is premature oncolytic virus clearance in humans, which
is a reasonable assumption considering the immune-stimulating nature of the
oncolytic agents. However, several studies are beginning to reveal layers of
restriction to oncolytic virotherapy that are present before an adaptive
neutralizing immune response. Some of these barriers are present constitutively
halting infection before it even begins, whereas others are raised by minute cues
triggered by virus infection. Indeed, we and others have noticed that delivering
viruses to tumors may not be the biggest obstacle to successful therapy, but
instead the physical make-up of the tumor and its capacity to mount antiviral
defenses seem to be the most important efficacy determinants. In this review, we
summarize the constitutive and innate barriers to oncolytic virotherapy and
discuss strategies to overcome them.