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2017 ; 6
(9
): 2164-2176
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Anticancer efficacy of the hypoxia-activated prodrug evofosfamide is enhanced in
combination with proapoptotic receptor agonists against osteosarcoma
#MMPMID28799237
Liapis V
; Zysk A
; DeNichilo M
; Zinonos I
; Hay S
; Panagopoulos V
; Shoubridge A
; Difelice C
; Ponomarev V
; Ingman W
; Atkins GJ
; Findlay DM
; Zannettino ACW
; Evdokiou A
Cancer Med
2017[Sep]; 6
(9
): 2164-2176
PMID28799237
show ga
Tumor hypoxia is a major cause of treatment failure for a variety of
malignancies. However, hypoxia also leads to treatment opportunities as
demonstrated by the development of compounds that target regions of hypoxia
within tumors. Evofosfamide is a hypoxia-activated prodrug that is created by
linking the hypoxia-seeking 2-nitroimidazole moiety to the cytotoxic
bromo-isophosphoramide mustard (Br-IPM). When evofosfamide is delivered to
hypoxic regions of tumors, the DNA cross-linking toxin, Br-IPM, is released
leading to cell death. This study assessed the anticancer efficacy of
evofosfamide in combination with the Proapoptotic Receptor Agonists (PARAs)
dulanermin and drozitumab against human osteosarcoma in vitro and in an
intratibial murine model of osteosarcoma. Under hypoxic conditions in vitro,
evofosfamide cooperated with dulanermin and drozitumab, resulting in the
potentiation of cytotoxicity to osteosarcoma cells. In contrast, under the same
conditions, primary human osteoblasts were resistant to treatment. Animals
transplanted with osteosarcoma cells directly into their tibiae developed mixed
osteosclerotic/osteolytic bone lesions and consequently developed lung metastases
3 weeks post cancer cell transplantation. Tumor burden in the bone was reduced by
evofosfamide treatment alone and in combination with drozitumab and prevented
osteosarcoma-induced bone destruction while also reducing the growth of pulmonary
metastases. These results suggest that evofosfamide may be an attractive
therapeutic agent, with strong anticancer activity alone or in combination with
either drozitumab or dulanermin against osteosarcoma.