Title

A brief evaluation of tumor imaging in mice with 99mTc-glucarate including a comparison with 18F-FDG

UMMS Affiliation

Department of Radiology, Division of Nuclear Medicine

Date

1-1-2011

Document Type

Article

Medical Subject Headings

Animals; Female; Fluorodeoxyglucose F18; Glucaric Acid; Mice; Mice, Nude; Neoplasm Transplantation; Neoplasms; Organotechnetium Compounds; Positron-Emission Tomography; Radiopharmaceuticals; Tomography, Emission-Computed, Single-Photon; Transplantation, Heterologous; Tumor Cells, Cultured

Disciplines

Cancer Biology | Medicinal and Pharmaceutical Chemistry | Medicinal-Pharmaceutical Chemistry | Radiology

Abstract

OBJECTIVE: Recently 99mTc-glucarate, a radiolabeled glucose analogue, has been considered as a SPECT alternative to 18F-FDG and PET for non-invasive detection of certain tumors. Thus far there have been few studies on (99m) Tcglucarate for tumor imaging and fewer, if any, studies comparing (99m)Tc-glucarate with 18F-FDG. As a preliminary indication of the properties of (99m)Tc-glucarate as a possible substitute for 18F-FDG in animal studies, we have imaged mice bearing xenografts of four tumor types with (99m)Tc-glucarate and have compared in two mice with one of these tumor types the 99mTc and 18F biodistributions.

METHODS: Two mice bearing SUM190 breast cancer xenografts received 1 mCi of (99m)Tc-glucarate and were imaged on a NanoSPECT/CT small animal camera. One day later, the same animals received 1 mCi of 18F-FDG and were imaged on a MosaicHP PET small animal camera. In addition, 0.5-1 mCi of (99m)Tc-glucarate only was administered to mice bearing xenografts induced by BxPC3 pancreatic cancer cells, HEK-293 renal cell carcinomas cells or HCT-116 colorectal tumor cells. NanoSPECT/CT acquisitions were performed in these mice to evaluate tumor accumulations.

RESULTS: In the SUM190 xenografted mice, the average tumor accumulation was 1.4 % (ID%/cm3) for (99m)Tc-glucarate and 2.1 % (ID%/cm3) for 18F-FDG. While slightly higher than (99m)Tc-glucarate, the tumor accumulation of 18F-FDG was accompanied by higher bone marrow and muscle accumulations at levels that could interfere with the tumor image depending upon location. The whole body clearance of (99m)Tc-glucarate was faster than that of 18F-FDG. Tumor accumulation of (99m)Tc-glucarate varied among tumor types but the tumors were readily visible in all images.

CONCLUSION: In a direct comparison in the same two SUM190 tumored animals, SPECT images obtained with (99m)Tcglucarate compared favorably with PET images obtained with 18F-FDG. Tumor images with 99mTc-glucarate were also positive in three additional tumor mouse models. While further comparison studies are necessary, we conclude that (99m)Tcglucarate may be a more convenient and less expensive alternative to 18F-FDG for tumored mouse studies.

Rights and Permissions

Citation: Curr Radiopharm. 2011 Jan;4(1):5-9. DOI: 10.2174/1874471011104010005

Related Resources

Link to Article in PubMed

Keywords

18F-FDG, 99mTc-glucarate, positron emission tomography (PET), single photon emission computed tomography (SPECT), molecular imaging, tumor, Small Animal SPECT/CT, Radioactive Tracers, PET, Tumor Model

PubMed ID

22191610