Assessment of regional tumor hypoxia using 18F- fluoromisonidazole and 64Cu(II)-diacetyl-bis(N4- methylthiosemicarbazone) positron emission tomography: Comparative study featuring microPET imaging, Po2 probe measurement, autoradiography, and fluorescent microscopy in the R3327-AT and FaDu rat tumor models Journal Article

  

Authors:	O'Donoghue, J. A.; Zanzonico, P.; Pugachev, A.; Wen, B.; Smith-Jones, P.; Cai, S.; Burnazi, E.; Finn, R. D.; Burgman, P.; Ruan, S.; Lewis, J. S.; Welch, M. J.; Ling, C. C.; Humm, J. L.
Article Title:	Assessment of regional tumor hypoxia using 18F- fluoromisonidazole and 64Cu(II)-diacetyl-bis(N4- methylthiosemicarbazone) positron emission tomography: Comparative study featuring microPET imaging, Po2 probe measurement, autoradiography, and fluorescent microscopy in the R3327-AT and FaDu rat tumor models
Abstract:	Purpose: To compare two potential positron emission tomography (PET) tracers of tumor hypoxia in an animal model. Methods and Materials: The purported hypoxia imaging agents 18F-fluoromisonidazole (FMISO) and 64Cu(II)-diacetyl-bis(N4-methylthiosemicarbazone) (Cu-ATSM) were compared by serial microPET imaging of Fisher-Copenhagen rats bearing the R3327-AT anaplastic rat prostate tumor. Probe measurements of intratumoral Po2 were compared with the image data. At the microscopic level, the relationship between the spatial distributions of 64Cu (assessed by digital autoradiography) and tumor hypoxia (assessed by immunofluorescent detection of pimonidazole) was examined. 18F-FMISO and 64Cu-ATSM microPET images were also acquired in nude rats bearing xenografts derived from the human squamous cell carcinoma cell line, FaDu. Results: In R3327-AT tumors, the intratumoral distribution of 18F-FMISO remained relatively constant 1-4 h after injection. However, that of 64Cu-ATSM displayed a significant temporal evolution for 0.5-20 h after injection in most tumors. In general, only when 64Cu-ATSM was imaged at later times (16-20 h after injection) did it correspond to the distribution of 18F-FMISO. Oxygen probe measurements were broadly consistent with 18F-FMISO and late 64Cu-ATSM images but not with early 64Cu-ATSM images. At the microscopic level, a negative correlation was found between tumor hypoxia and 64Cu distribution when assessed at early times and a positive correlation when assessed at later times. For the FaDu tumor model, the early and late 64Cu-ATSM microPET images were similar and were in general concordance with the 18F-FMISO scans. Conclusion: The difference in behavior between the R3327-AT and FaDu tumor models suggests a tumor-specific dependence of Cu-ATSM uptake and retention under hypoxic conditions. © 2005 Elsevier Inc.
Keywords:	immunohistochemistry; controlled study; unclassified drug; squamous cell carcinoma; nonhuman; positron emission tomography; radiopharmaceuticals; neoplasms; animals; animal experiment; animal model; hypoxia; imaging system; correlation analysis; drug distribution; drug retention; drug uptake; xenograft; medical imaging; tumors; prostate tumor; rat; fluorodeoxyglucose f18; positron-emission tomography; transplantation, heterologous; intermethod comparison; fluorescence microscopy; microscopy, fluorescence; 1 fluoro 3 (2 nitro 1 imidazolyl) 2 propanol f 18; hoe 33342; pimonidazole; tumor model; cell hypoxia; rats; misonidazole; oxygen tension; rats, nude; radioisotope; tumor; fluorine 18; radiation-sensitizing agents; organometallic compounds; copper 64; carcinoma cell; tumor hypoxia; thiosemicarbazones; autoradiography; nitroimidazoles; benzimidazoles; animal models; carcinogens; cells; biodiversity; fluorescent microscopy; microscopic examination; correlation function; cancer graft; rat strain; correlative study; hoechst 33342; oxygen probe; diacetyl bis(n4 methylthiosemicarbazone) cu 64; micropositron emission tomography
Journal Title:	International Journal of Radiation Oncology, Biology, Physics
Volume:	61
Issue:	5
ISSN:	0360-3016
Publisher:	Elsevier Inc.
Date Published:	2005-04-01
Start Page:	1493
End Page:	1502
Language:	English
DOI:	10.1016/j.ijrobp.2004.12.057
PUBMED:	15817355
PROVIDER:	scopus
DOI/URL:	http://www.scopus.com/inward/record.url?eid=2-s2.0-20144387807&partnerID=40&md5=59f97202a5af7bd606a1d440f63afb69
Notes:	--- - "Cited By (since 1996): 88" - "Export Date: 24 October 2012" - "CODEN: IOBPD" - "Source: Scopus"

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