Colorectal tumor cells treated with 5-FU, oxaliplatin, irinotecan, and cetuximab exhibit changes in 18F-FDG incorporation corresponding to hexokinase activity and glucose transport.

Unlabelled: The purpose of this study was to determine therapy-induced changes in 18F-FDG incorporation at the colorectal tumor cell level in response to conventional and novel chemotherapy agents and examine how these changes relate to factors involved in 18F-FDG incorporation.

Methods: SW620 cells were treated with inhibitory concentration of 50% (IC50) doses (determined by MTT) of 5-fluorouracil (5-FU), oxaliplatin, and irinotecan; HCT-8 cells were treated with IC50 doses of irinotecan, cetuximab, and irinotecan plus cetuximab. 18F-FDG incorporation, glucose transport, hexokinase (HK) activity, adenosine triphosphate (ATP) content, annexin V binding, and cell cycle distribution were determined after 24-, 48-, and 72-h treatments.

Decreased [18F]fluoro-2-deoxy-d-glucose incorporation and increased glucose transport are associated with resistance to 5FU in MCF7 cells in vitro.

Introduction: Tumor refractoriness to chemotherapy is frequently due to the acquisition of resistance. Resistant cells selected by exposure to chemotherapy agents may exhibit differences in [18F]fluoro-2-deoxy-d-glucose (FDG) incorporation, as compared with sensitive cells.

Methods: FDG incorporation, hexokinase (HK) activity, glucose transport and ATP content were determined in clones of 5-fluorouracil (5FU)-resistant MCF7 cells, established by long-term exposure to increasing 5FU concentrations, and in parental MCF7 cells.

Tumor 18F-FDG incorporation is enhanced by attenuation of P53 function in breast cancer cells in vitro.

Unlabelled: Mutations in the p53 gene, often resulting in loss of wild-type (WT) p53 expression, are found at high frequencies in several cancer types. High uptake of (18)F-FDG detected using (18)F-FDG PET has been associated with a poor prognosis. To determine whether high (18)F-FDG uptake may be related to decreased expression of WT p53, we examined (18)F-FDG uptake in cells transfected with dominant negative p53 constructs that abrogate WT p53 function.