Evaluation of [18F]Fluorothymidine as a Biomarker for Early Therapy Response in a Mouse Model of Colorectal Cancer.
Mol Imaging Biol
; 19(1): 109-119, 2017 02.
Article
in En
| MEDLINE
| ID: mdl-27324368
ABSTRACT
PURPOSE:
In oncology, positron emission tomography imaging using dedicated tracers as biomarkers may assist in early evaluation of therapy efficacy. Using 3'-deoxy-3'-[18F]fluorothymidine ([18F]FLT), we investigated the early effects of chemotherapeutic treatment on cancer cell proliferation in a BRAF-mutated colorectal cancer xenograft model. PROCEDURES Colo205 subcutaneously inoculated animals underwent 90-min dynamic imaging before and 24 h after treatment with vehicle (control), cetuximab (resistant) or irinotecan (sensitive). Total distribution volume was quantified from dynamic data, and standardized uptake values as well as tumor-to-blood ratios were calculated from static images averaged over the last 20 min. In vivo imaging data was correlated with ex vivo proliferation and thymidine metabolism proteins.RESULTS:
All imaging parameters showed a significant post-treatment decrease from [18F]FLT baseline uptake for the irinotecan group (p ≤ 0.001) as compared with the cetuximab and vehicle group and correlated strongly with each other (p ≤ 0.0001). In vivo data were in agreement with Ki67 staining, showing a significantly lower percentage of Ki67-positive cells in the irinotecan group as compared with other groups (p ≤ 0.0001). Tumor expression of thymidine kinase 1 phosphorylated on serine 13, thymidylate synthase, and thymidine phosphorylase remained unaffected, while thymidine kinase 1 expression was, surprisingly, significantly higher in irinotecan-treated animals (p ≤ 0.01). In contrast, tumor ATP levels were lowest in this group.CONCLUSIONS:
[18F]FLT positron emission tomography was found to be a suitable biomarker of early tumor response to anti-proliferative treatment, with static imaging not being inferior to full compartmental analysis in our xenograft model. The dynamics of thymidine kinase 1 protein expression and protein activity in low ATP environments merits further investigation.Key words
Full text:
1
Collection:
01-internacional
Database:
MEDLINE
Main subject:
Thymidine
/
Colorectal Neoplasms
/
Dideoxynucleosides
/
Biomarkers, Tumor
Type of study:
Prognostic_studies
Limits:
Animals
Language:
En
Journal:
Mol Imaging Biol
Journal subject:
BIOLOGIA MOLECULAR
/
DIAGNOSTICO POR IMAGEM
Year:
2017
Document type:
Article
Affiliation country: