[(18)F]-FLT PET to predict early response to neoadjuvant therapy in KRAS wild-type rectal cancer: a pilot study.

Autor: McKinley, Eliot T, Watchmaker, Jennifer M, Bapsi Chakravarthy, A, Meyerhardt, Jeffrey A, Engelman, Jeffrey A, Walker, Ronald C, Kay Washington, M, Coffey, Robert J, Charles Manning, H, Chakravarthy, A Bapsi, Washington, M Kay, Manning, H Charles
Zdroj: Annals of Nuclear Medicine; Jul2015, Vol. 29 Issue 6, p535-542, 8p
Abstrakt: Object: This pilot study evaluated the utility of 3'-deoxy-3'[18F]-fluorothymidine ([(18)F]-FLT) positron emission tomography (PET) to predict response to neoadjuvant therapy that included cetuximab in patients with wild-type KRAS rectal cancers.Methods: Baseline [(18)F]-FLT PET was collected prior to treatment initiation. Follow-up [(18)F]-FLT was collected after three weekly infusions of cetuximab, and following a combined regimen of cetuximab, 5-FU, and radiation. Imaging-matched biopsies were collected with each PET study.Results: Diminished [(18)F]-FLT PET was observed in 3/4 of patients following cetuximab treatment alone and in all patients following combination therapy. Reduced [(18)F]-FLT PET following combination therapy predicted disease-free status at surgery. Overall, [(18)F]-FLT PET agreed with Ki67 immunoreactivity from biopsy samples and surgically resected tissue, and was predictive of treatment-induced rise in p27 levels.Conclusion: These results suggest that [(18)F]-FLT PET is a promising imaging biomarker to predict response to neoadjuvant therapy that included EGFR blockade with cetuximab in patients with rectal cancer. [ABSTRACT FROM AUTHOR]
Databáze: Complementary Index