In a meta-analysis of 27 articles involving 1213 lung cancer patients for correlating FDG uptake (22 studies) or FLT uptake (eight studies) with Ki-67 expression, the rho coefficient for 18F-FDG/Ki-67 and 18F-FLT/Ki-67 was 0.45 (95% CI, 0.41–0.50) and 0.65 (95% CI, 0.56–0.73), respectively, which indicated a moderate correlation for 18F-FDG and a significant one for 18F-FLT [8]. This evidence concerns the gene MKI67 and lung cancer.