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PDQ Cancer Information Summaries [Internet]. Bethesda (MD): National Cancer Institute (US); 2002-.

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PDQ Cancer Information Summaries [Internet].

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Table 3. Children's Oncology Group and EuroNet Definition of PET Response of Lymph Node or Nodal Masses

Timing of 18F-FDG PET 18F-FDG PET Avidity
Baseline PET (PET 0) response visual threshold uses mediastinal blood pool as the reference activity:18F-FDG PET positive is defined as visual score 3, 4, 5.
18F-FDG PET negative is defined as visual score 1, 2.
Interim postcycle 2 PET (PET 2) response visual threshold uses normal liver as the reference activity:18F-FDG PET positive is defined as visual score 4, 5.
18F-FDG PET negative is defined as visual score 1, 2, 3.
End of chemotherapy PET (PET 4 or 5) response visual threshold also uses mediastinal blood pool as the reference activity:18F-FDG PET positive is defined as visual score 3, 4, 5.
18F-FDG PET negative is defined as visual score 1, 2.

18F-FDG = fluorine F 18-fludeoxyglucose; PET = positron emission tomography.

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