Keywords: 18F-FSPG, (S)-4-(3-[18F]-fluoropropyl)-L-glutamic acid; Apc, adenomatous polyposis coli; CRC, colorectal cancer; DLD-1, Daniel L. Dexter derived 1; FAD, flavin adenine dinucleotide; GLUT-1, glucose transporter 1; KO, knockout; KRAS, Kirsten rat sarcoma viral oncogene homolog; NADH, Nicotinamide adenine dinucleotide reduced; WT, wild-type.