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Measurements of hypoxia ([ 18 F]‐FMISO, [ 18 F]‐EF5) with positron emission tomography (PET) and perfusion using PET ([ 15 O]‐H 2 O) and power Doppler ultrasonography in feline fibrosarcomas *
Author(s) -
Allemann K.,
Wyss M. T.,
Wergin M.,
Ohlerth S.,
RohrerBley C.,
Evans S. M.,
Schubiger A. P.,
Ametamey S. M.,
KaserHotz B.
Publication year - 2005
Publication title -
veterinary and comparative oncology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.864
H-Index - 34
eISSN - 1476-5829
pISSN - 1476-5810
DOI - 10.1111/j.1476-5810.2005.00081.x
Subject(s) - positron emission tomography , perfusion , hypoxia (environmental) , nuclear medicine , cats , vascularity , chemistry , medicine , pathology , oxygen , radiology , organic chemistry
The aim of this study was to evaluate if hypoxia in feline fibrosarcomas can be detected. This was done using positron emission tomography (PET), two hypoxia tracers and polarographic pO 2 measurements. Of the seven cats included, five received [ 18 F]‐fluoromisonidazole and two 2‐(2‐nitro‐1H‐imidazol‐1‐yl)‐N‐(2,2,3,3,3‐pentafluoropropyl) acetamide. Perfusion was evaluated with [ 15 O]‐H 2 O ( n = 4) and with contrast‐enhanced power Doppler ultrasonography ( n = 5). Hypoxia was detected in three cats. Polarographic pO 2 measurements did not confirm PET results. In the ultrasonographic evaluation, low vascularity and low perfusion were seen with a peripheral vascular pattern and no perfusion in the centre of the tumour. This was in contrast to the [ 15 O]‐H 2 O scans, where central perfusion of the tumour was also found. In conclusion, it appears that hypoxia exists in this tumour type. The presence of tumour necrosis and heterogeneous hypoxia patterns in these tumours may explain the found discrepancies between the applied techniques.