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2017 ; 7
(1
): 2365
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The "inherent vice" in the anti-angiogenic theory may cause the highly metastatic
cancer to spread more aggressively
#MMPMID28539645
Wang D
; Tan C
; Xiao F
; Zou L
; Wang L
; Wei Y
; Yang H
; Zhang W
Sci Rep
2017[May]; 7
(1
): 2365
PMID28539645
show ga
Although anti-angiogenic (AA) therapy is widely used in clinical practice, it is
often challenged by insufficient efficacy and intrinsic resistance. Some studies
have reported that AA therapy can even increase tumor metastasis. However,
whether this is due to a specific AA drug causing a specific tumor to metastasize
or because the anti-angiogenic theory has some "inherent vice" that may
inevitably lead to tumor dissemination remains a mystery. Herein, we designed a
model that completely blocks tumor blood supply using a physical barrier to
examine tumor behavior in such circumstances. Surprisingly, we found that cutting
off the blood supply could neither eliminate the primary tumor cells nor prevent
local invasion or formation of distant metastases. By using a mathematical method
to simulate tumor behavior, we found that blocking tumor blood supply may lead to
an inevitable consequence: the cells that can tolerate blood deficiency are
"naturally selected" and survive, whereas a portion of cells are promoted to
escape from the "starvation" area by the consistent environmental stress until
they are spread throughout the body. This may be an intrinsic disadvantage of the
AA strategy, which will inevitably cause the tumor, particularly highly
metastatic tumors, to spread more aggressively.