期刊
MOLECULAR IMAGING AND BIOLOGY
卷 17, 期 1, 页码 119-128出版社
SPRINGER
DOI: 10.1007/s11307-014-0770-z
关键词
[F-18]FLT-PET; Assessing treatment response; HER2+xenografts; Breast cancer; Trastuzumab
资金
- National Institutes of Health [R01 CA138599, R01 CA80195]
- Vanderbilt Breast Cancer SPORE [P50 CA98131]
- Vanderbilt-Ingram Cancer Center [P30 CA68485, U24 CA126588, P50 CA12832, 1 S10 RR17858]
- NATIONAL CANCER INSTITUTE [P50CA095103, U24CA126588, R01CA080195, P30CA068485, R01CA138599, P50CA128323, P50CA098131] Funding Source: NIH RePORTER
- NATIONAL CENTER FOR RESEARCH RESOURCES [S10RR017858] Funding Source: NIH RePORTER
Purpose: The objective of this study was to evaluate 3'-deoxy-3'-[F-18]fluorothymidine ([F-18]FLT) positron emission tomography (PET) as an early marker of trastuzumab response in HER2-overexpressing xenografts. Procedures: Tumor-to-muscle ratios were compared between both trastuzumab-sensitive and trastuzumab-resistant cohorts prior to and after one and two treatments. Results: A significant difference (P=0.03) was observed between treated and control trastuzumab-sensitive xenografts after one treatment, which preceded between-group differences in tumor volume. Reduced Ki67 (P=0.02) and thymidine kinase 1 (TK1) (P=0.35) immunoreactivity was observed in the treated xenografts. No significant differences in volume, tumor-to-muscle ratio, or immunoreactivity were observed between treated and control trastuzumab-resistant cohorts. A significant difference (P=0.02) in tumor-to-muscle ratio was observed between trastuzumab-sensitive and trastuzumab-resistant cohorts after two treatments; however, tumor volumes were also different (P=0.04). Ki67 (P=0.04) and TK1 (P=0.24) immunoreactivity was similar to 50 % less in trastuzumab-sensitive xenografts. Conclusions: [F-18]FLT-PET provided early response assessment in trastuzumab-sensitive xenografts but only differentiated between trastuzumab-resistant and trastuzumab-sensitive xenografts concurrent with differences in tumor size.
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