MKI67 and colorectal cancer: In a recent survey of published preclinical studies, [18F]-FLT uptake was found to correlate with Ki67 indices in lung cancer [28], B-cell lymphoma [15] and epithelial cancer [28], but did not correlate with Ki67 in colorectal cancer [29], neuroblastoma [30], or across a variety of xenograft types [27].