KRAS and neoplasm: In this study, we investigate if there exists a relationship between EGFR mutations and/or KRAS mutations in NSCLC status and several FDG-PET/CT parameters such as maximum standardized uptake value (SUVmax), metabolic tumor volume (MTV), total lesion glycolysis (TLG), and tumor heterogeneity, in order to determine the FDG-PET/CT metrics that are most predictive of a gene mutation.