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2015 ; 5
(ä): 14999
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Bursts of Bipolar Microsecond Pulses Inhibit Tumor Growth
#MMPMID26459930
Sano MB
; Arena CB
; Bittleman KR
; DeWitt MR
; Cho HJ
; Szot CS
; Saur D
; Cissell JM
; Robertson J
; Lee YW
; Davalos RV
Sci Rep
2015[Oct]; 5
(ä): 14999
PMID26459930
show ga
Irreversible electroporation (IRE) is an emerging focal therapy which is
demonstrating utility in the treatment of unresectable tumors where thermal
ablation techniques are contraindicated. IRE uses ultra-short duration,
high-intensity monopolar pulsed electric fields to permanently disrupt cell
membranes within a well-defined volume. Though preliminary clinical results for
IRE are promising, implementing IRE can be challenging due to the heterogeneous
nature of tumor tissue and the unintended induction of muscle contractions.
High-frequency IRE (H-FIRE), a new treatment modality which replaces the
monopolar IRE pulses with a burst of bipolar pulses, has the potential to resolve
these clinical challenges. We explored the pulse-duration space between 250 ns
and 100 ?s and determined the lethal electric field intensity for specific H-FIRE
protocols using a 3D tumor mimic. Murine tumors were exposed to 120 bursts, each
energized for 100 ?s, containing individual pulses 1, 2, or 5 ?s in duration.
Tumor growth was significantly inhibited and all protocols were able to achieve
complete regressions. The H-FIRE protocol substantially reduces muscle
contractions and the therapy can be delivered without the need for a
neuromuscular blockade. This work shows the potential for H-FIRE to be used as a
focal therapy and merits its investigation in larger pre-clinical models.