18F-fluorothymidine PET/CT as an early predictor of tumor response to treatment with cetuximab in human lung cancer xenografts.

Abstract:

:We investigated whether 18F-fluorothymidine-positron-emission tomography/computed tomography (18F-FLT-PET/CT) is useful for the evaluation of the very early response to anti-epidermal growth factor receptor (EGFR) antibody cetuximab therapy in human lung cancer xenografts. A human tumor xenograft model was established with a human non-small cell lung cancer cell line. The mice were randomly assigned to four groups: tumor growth follow-up, ex vivo study, PET/CT imaging and non-treated control. Mice were administered saline as control or cetuximab on day 1. An immunohistochemical study with Ki-67 was performed. Tumor volume treated with cetuximab was kept significantly smaller than control after day 8, although there was no difference on day 3. On day 3, 18F-FLT distribution was higher in the tumor than in other tissues, and was significantly decreased by treatment with cetuximab. On PET/CT imaging, 18F-FLT distribution in the tumor was clearly visualized, and the maximum standardized uptake value (SUV) was significantly decreased after treatment with cetuximab (p<0.01). Ki-67 expression was also significantly decreased on day 3 (p=0.01). These results suggest that 18F-FLT-PET/CT can be a useful predictor to determine the response to molecular targeted drugs such as cetuximab at an earlier time point than the change of tumor size.

journal_name

Oncol Rep

journal_title

Oncology reports

authors

Takeuchi S,Zhao S,Kuge Y,Zhao Y,Nishijima K,Hatano T,Shimizu Y,Kinoshita I,Tamaki N,Dosaka-Akita H

doi

10.3892/or.2011.1338

subject

Has Abstract

pub_date

2011-09-01 00:00:00

pages

725-30

issue

3

eissn

1021-335X

issn

1791-2431

journal_volume

26

pub_type

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