First Evaluation of the Biologic Effectiveness Factors of Boron Neutron Capture Therapy (BNCT) in a Human Colon Carcinoma Cell Line

Journal Article · Sat Jan 01 00:00:00 EST 2011 · International Journal of Radiation Oncology, Biology and Physics

DOI:https://doi.org/10.1016/j.ijrobp.2010.07.020· OSTI ID:21499710

Crivello, Martin ^[1]; Perona, Marina ^[2]; Thorp, Silvia; Santa Cruz, Gustavo Alberto ^[3]; Pozzi, Emiliano ^[4]; Casal, Mariana ^[5]; Thomasz, Lisa; Cabrini, Romulo ^[2]; Kahl, Steven ^[6]; Juvenal, Guillermo Juan ^[2]; Pisarev, Mario Alberto ^[2]

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1. Department of Radiobiology, National Atomic Energy Commission, Buenos Aires(Argentina)
2. Department of Radiobiology, National Atomic Energy Commission, Buenos Aires (Argentina)
3. Department of Instrumentation and Control, National Atomic Energy Commission, Buenos Aires (Argentina)
4. Argentina Reactor, National Atomic Energy Commission, Buenos Aires (Argentina)
5. Institute of Oncology 'Angel H. Roffo', University of Buenos Aires (Argentina)
6. Department of Pharmaceutical Chemistry, University of California, San Francisco, CA (United States)

Purpose: DNA lesions produced by boron neutron capture therapy (BNCT) and those produced by gamma radiation in a colon carcinoma cell line were analyzed. We have also derived the relative biologic effectiveness factor (RBE) of the neutron beam of the RA-3- Argentine nuclear reactor, and the compound biologic effectiveness (CBE) values for p-boronophenylalanine ({sup 10}BPA) and for 2,4-bis ({alpha},{beta}-dihydroxyethyl)-deutero-porphyrin IX ({sup 10}BOPP). Methods and Materials: Exponentially growing human colon carcinoma cells (ARO81-1) were distributed into the following groups: (1) BPA (10 ppm {sup 10}B) + neutrons, (2) BOPP (10 ppm {sup 10}B) + neutrons, (3) neutrons alone, and (4) gamma rays ({sup 60}Co source at 1 Gy/min dose-rate). Different irradiation times were used to obtain total absorbed doses between 0.3 and 5 Gy ({+-}10%) (thermal neutrons flux = 7.5 10{sup 9} n/cm{sup 2} sec). Results: The frequency of micronucleated binucleated cells and the number of micronuclei per micronucleated binucleated cells showed a dose-dependent increase until approximately 2 Gy. The response to gamma rays was significantly lower than the response to the other treatments (p < 0.05). The irradiations with neutrons alone and neutrons + BOPP showed curves that did not differ significantly from, and showed less DNA damage than, irradiation with neutrons + BPA. A decrease in the surviving fraction measured by 3-(4,5-dimetiltiazol-2-il)-2,5-difeniltetrazolium bromide (MTT) assay as a function of the absorbed dose was observed for all the treatments. The RBE and CBE factors calculated from cytokinesis block micronucleus (CBMN) and MTT assays were, respectively, the following: beam RBE: 4.4 {+-} 1.1 and 2.4 {+-} 0.6; CBE for BOPP: 8.0 {+-} 2.2 and 2.0 {+-} 1; CBE for BPA: 19.6 {+-} 3.7 and 3.5 {+-} 1.3. Conclusions: BNCT and gamma irradiations showed different genotoxic patterns. To our knowledge, these values represent the first experimental ones obtained for the RA-3 in a biologic model and could be useful for future experimental studies for the application of BNCT to colon carcinoma.

• OSTI ID: 21499710
• Journal Information: International Journal of Radiation Oncology, Biology and Physics, Vol. 79, Issue 1; Other Information: DOI: 10.1016/j.ijrobp.2010.07.020; PII: S0360-3016(10)00951-X; Copyright (c) 2011 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; ISSN 0360-3016
• Country of Publication: United States
• Language: English

Related Subjects

62 RADIOLOGY AND NUCLEAR MEDICINE
BORON
CARCINOMAS
DNA DAMAGES
EVALUATION
GAMMA RADIATION
LARGE INTESTINE
NEUTRON CAPTURE THERAPY
RBE
BODY
DIGESTIVE SYSTEM
DISEASES
ELECTROMAGNETIC RADIATION
ELEMENTS
GASTROINTESTINAL TRACT
INTESTINES
IONIZING RADIATIONS
MEDICINE
NEOPLASMS
NEUTRON THERAPY
NUCLEAR MEDICINE
ORGANS
RADIATIONS
RADIOLOGY
RADIOTHERAPY
SEMIMETALS
THERAPY