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Open Access 01-12-2014 | Research article

Dual tracer evaluation of dynamic changes in intratumoral hypoxic and proliferative states after radiotherapy of human head and neck cancer xenografts using radiolabeled FMISO and FLT

Authors: Chowdhury Nusrat Fatema, Songji Zhao, Yan Zhao, Wenwen Yu, Ken-ichi Nishijima, Koichi Yasuda, Yoshimasa Kitagawa, Nagara Tamaki, Yuji Kuge

Published in: BMC Cancer | Issue 1/2014

Abstract

Background

Radiotherapy is an important treatment strategy for head and neck cancers. Tumor hypoxia and repopulation adversely affect the radiotherapy outcome. Accordingly, fractionated radiotherapy with dose escalation or altered fractionation schedule is used to prevent hypoxia and repopulation. ¹⁸F-fluoromisonidazole (FMISO) and ¹⁸F-fluorothymidine (FLT) are noninvasive markers for assessing tumor hypoxia and proliferation, respectively. Thus, we evaluated the dynamic changes in intratumoral hypoxic and proliferative states following radiotherapy using the dual tracers of ¹⁸F-FMISO and ³H-FLT, and further verified the results by immunohistochemical staining of pimonidazole (a hypoxia marker) and Ki-67 (a proliferation marker) in human head and neck cancer xenografts (FaDu).

Methods

FaDu xenografts were established in nude mice and assigned to the non-radiation-treated control and two radiation-treated groups (10- and 20-Gy). Tumor volume was measured daily. Mice were sacrificed 6, 24, and 48 hrs and 7 days after radiotherapy. ¹⁸F-FMISO, and ³H-FLT and pimonidazole were injected intravenously 4 and 2 hrs before sacrifice, respectively. Intratumoral ¹⁸F-FMISO and ³H-FLT levels were assessed by autoradiography. Pimonidazole and Ki-67 immunohistochemistries were performed.

Results

In radiation-treated mice, tumor growth was significantly suppressed compared with the control group, but the tumor volume in these mice gradually increased with time. Visual inspection showed that intratumoral ¹⁸F-FMISO and ³H-FLT distribution patterns were markedly different. Intratumoral ¹⁸F-FMISO level did not show significant changes after radiotherapy among the non-radiation-treated control and radiation-treated groups, whereas ³H-FLT level markedly decreased to 59 and 45% of the non-radiation-treated control at 6 hrs (p < 0.0001) and then gradually increased with time in the 10- and 20-Gy-radiation-treated groups. The pimonidazole-positive hypoxic areas were visually similar in both the non-radiation-treated control and radiation-treated groups. No significant differences were observed in the percentage of pimonidazole-positive cells and Ki-67 index.

Conclusion

Intratumoral ¹⁸F-FMISO level did not change until 7 days, whereas ³H-FLT level markedly decreased at 6 hrs and then gradually increased with time after a single dose of radiotherapy. The concomitant monitoring of dynamic changes in tumor hypoxia and proliferation may provide important information for a better understanding of tumor biology after radiotherapy and for radiotherapy planning, including dose escalation and altered fractionation schedules.

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The pre-publication history for this paper can be accessed here:http://www.biomedcentral.com/1471-2407/14/692/prepub

Title: Dual tracer evaluation of dynamic changes in intratumoral hypoxic and proliferative states after radiotherapy of human head and neck cancer xenografts using radiolabeled FMISO and FLT
Authors: Chowdhury Nusrat Fatema
Songji Zhao
Yan Zhao
Wenwen Yu
Ken-ichi Nishijima
Koichi Yasuda
Yoshimasa Kitagawa
Nagara Tamaki
Yuji Kuge
Publication date: 01-12-2014
Publisher: BioMed Central
Published in: BMC Cancer / Issue 1/2014
Electronic ISSN: 1471-2407
DOI: https://doi.org/10.1186/1471-2407-14-692

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