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2017 ; 10
(4
): 686-692
Nephropedia Template TP
gab.com Text
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English Wikipedia
Validation and Comparison of the Therapeutic Efficacy of Boron Neutron Capture
Therapy Mediated By Boron-Rich Liposomes in Multiple Murine Tumor Models
#MMPMID28683435
Maitz CA
; Khan AA
; Kueffer PJ
; Brockman JD
; Dixson J
; Jalisatgi SS
; Nigg DW
; Everett TA
; Hawthorne MF
Transl Oncol
2017[Aug]; 10
(4
): 686-692
PMID28683435
show ga
Boron neutron capture therapy (BNCT) was performed at the University of Missouri
Research Reactor in mice bearing CT26 colon carcinoma flank tumors and the
results were compared with previously performed studies with mice bearing EMT6
breast cancer flank tumors. Mice were implanted with CT26 tumors subcutaneously
in the caudal flank and were given two separate tail vein injections of
unilamellar liposomes composed of cholesterol,
1,2-distearoyl-sn-glycer-3-phosphocholine, and
K[nido-7-CH(3)(CH(2))(15)-7,8-C(2)B(9)H(11)] in the lipid bilayer and
encapsulated Na(3)[1-(2`-B(10)H(9))-2-NH(3)B(10)H(8)] within the liposomal core.
Mice were irradiated 30 hours after the second injection in a thermal neutron
beam for various lengths of time. The tumor size was monitored daily for 72 days.
Despite relatively lower tumor boron concentrations, as compared to EMT6 tumors,
a 45 minute neutron irradiation BNCT resulted in complete resolution of the
tumors in 50% of treated mice, 50% of which never recurred. Median time to tumor
volume tripling was 38 days in BNCT treated mice, 17 days in neutron-irradiated
mice given no boron compounds, and 4 days in untreated controls. Tumor response
in mice with CT26 colon carcinoma was markedly more pronounced than in previous
reports of mice with EMT6 tumors, a difference which increased with dose. The
slope of the dose response curve of CT26 colon carcinoma tumors is 1.05 times
tumor growth delay per Gy compared to 0.09 times tumor growth delay per Gy for
EMT6 tumors, indicating that inherent radiosensitivity of tumors plays a role in
boron neutron capture therapy and should be considered in the development of
clinical applications of BNCT in animals and man.