How few cancer cells can be detected by positron emission tomography? A frequent question addressed by an in vitro study.

European Journal of Nuclear Medicine and Molecular Imaging
Barbara M FischerPaul E G Kristjansen

Abstract

Positron emission tomography (PET) has gained widespread use in cancer diagnosis and treatment, but how many malignant cells are required for a tumour to be detected by PET? Three human cancer cell lines [glioblastoma and two subtypes of small cell lung cancer (SCLC)] in concentrations from 10(4) to 10(7) were seeded on six-well plates or plastic tubes and treated with [(18)F]fluorodeoxy-glucose (FDG) in vitro. FDG retention was measured in a PET/CT scanner and in a calibrated well counter. The clinical situation was simulated using a cylinder phantom with a background concentration of FDG. The theoretical detection limit was found to be around 10(5) malignant cells. In a cylinder phantom the detection limit was increased by a factor of 10. The FDG retention by the glioblastoma cell line was significantly higher than the activity of the SCLC cell line. FDG retention measured by PET and a gamma counter was closely correlated to the number of cells and a linear relationship was found. The detection limit of PET is in the magnitude of 10(5) to 10(6) malignant cells. The experimental set-up was robust and well suited as a platform for further investigations of factors influencing the detection limit of PET.

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Feb 20, 2007·European Journal of Nuclear Medicine and Molecular Imaging·Liselotte Højgaard, Lena Specht
Feb 20, 2008·European Journal of Nuclear Medicine and Molecular Imaging·Ruoh-Fang YenYung-Chie Lee
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