These findings with 18F-FSPG may be similar to those which have been established with 18F-FDG; it is known that the SUV of 18F-FDG rises with increased proliferative activity and biological aggressiveness of the tumour tissue, and SUV was shown to have a statistically significant positive correlation with Ki67 across a variety of subtypes of non-Hodgkin’s lymphoma [47]. Here, MKI67 is linked to non-Hodgkin lymphoma.