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2017 ; 108
(9
): 1787-1792
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Biological effects of hydrogen peroxide administered intratumorally with or
without irradiation in murine tumors
#MMPMID28627761
Takaoka T
; Shibamoto Y
; Matsuo M
; Sugie C
; Murai T
; Ogawa Y
; Miyakawa A
; Manabe Y
; Kondo T
; Nakajima K
; Okazaki D
; Tsuchiya T
Cancer Sci
2017[Sep]; 108
(9
): 1787-1792
PMID28627761
show ga
Despite insufficient laboratory data, radiotherapy after intratumoral injection
of hydrogen peroxide (H(2) O(2) ) is increasingly being used clinically for
radioresistant tumors. Especially, this treatment might become an alternative
definitive treatment for early and advanced breast cancer in patients who refuse
any type of surgery. The purpose of this study was to investigate the biological
effects and appropriate combination methods of irradiation and H(2) O(2) in vivo.
SCCVII tumor cells transplanted into the legs of C3H/HeN mice were used.
Chronological changes of intratumoral distribution of oxygen bubbles after
injection of H(2) O(2) were investigated using computed tomography. The effects
of H(2) O(2) alone and in combination with single or five-fraction irradiation
were investigated using a growth delay assay. The optimal timing of H(2) O(2)
injection was investigated. Immunostaining of tumors was performed using the
hypoxia marker pimonidazole. Oxygen bubbles decreased gradually and almost
disappeared after 24 h. Administration of H(2) O(2) produced 2-3 days' tumor
growth delay. Tumor regrowth was slowed further when H(2) O(2) was injected
before irradiation. The group irradiated immediately after H(2) O(2) injection
showed the longest tumor growth delay. Dose-modifying factors were 1.7-2.0 when
combined with single irradiation and 1.3-1.5 with fractionated irradiation.
Pimonidazole staining was weaker in tumors injected with H(2) O(2) . H(2) O(2)
injection alone had modest antitumor effects. Greater tumor growth delays were
demonstrated by combining irradiation and H(2) O(2) injection. The results of the
present study could serve as a basis for evaluating results of various clinical
studies on this treatment.