Fig 1.
Flow diagram of study selection.
Fig 2.
Methodological quality of all eligible studies.
Fig 3.
Forest plots of the summary correlation coefficient (r) with corresponding 95% CIs for the correlation between 18F-FDG uptake and tumor cell proliferation in all eligible studies.
Fig 4.
The funnel plot of the publication bias.
Fig 5.
Forest plot of subgroup analysis based on cancer type.
Fig 6.
The combined correlation coefficient (r) with corresponding 95% CIs for the subgroup analysis based on sample, Ki-67 scoring method, Ki-67 imaging analysis, scanner and SUV.