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SPECT/CT of lung nodules using 111In-DOTA-c(RGDfK) in a mouse lung carcinogenesis model

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Abstract

Objective

Lung cancer is one of the leading causes of cancer-related deaths worldwide, including Japan. Although computed tomography (CT) can detect small lung lesions such as those appearing as ground glass opacity, it cannot differentiate between malignant and non-malignant lesions. Previously, we have shown that single photon emission computed tomography (SPECT) imaging using 111In-1,4,7,10-tetraazacyclododecane-N,N′,N′′,N′′′-tetraacetic acid-cyclo-(Arg-Gly-Asp-d-Phe-Lys) (DOTA-c(RGDfK)), an imaging probe of αvβ3 integrin, is useful for the early detection of pancreatic cancer in a hamster pancreatic carcinogenesis model. In this study, we aimed to assess the usefulness of SPECT/CT with 111In-DOTA-c(RGDfK) for the evaluation of the malignancy of lung cancer.

Methods

Lung tumors were induced by a single intraperitoneal injection (250 mg/kg) of urethane in male A/J mice. Twenty-six weeks after the urethane treatment, SPECT was performed an hour after injection of 111In-DOTA-c(RGDfK). Following this, the radioactivity ratios of tumor to normal lung tissue were measured by autoradiography (ARG) in the excised lung samples. We also examined the expression of αvβ3 integrin in mouse and human lung samples.

Results

Urethane treatment induced 5 hyperplasias, 41 adenomas and 12 adenocarcinomas in the lungs of 8 A/J mice. SPECT with 111In-DOTA-c(RGDfK) could clearly visualize lung nodules, though we failed to detect small lung nodules like adenoma and hyperplasias (adenocarcinoma: 66.7 %, adenoma: 33.6 %, hyperplasia: 0.0 %). ARG analysis revealed significant uptake of 111In-DOTA-c(RGDfK) in all the lesions. Moreover, tumor to normal lung tissue ratios increased along with the progression of carcinogenesis. Histopathological examination using human lung tissue samples revealed clear up-regulation of αvβ3 integrin in well-differentiated adenocarcinoma (Noguchi type B and C) rather than atypical adenomatous hyperplasia.

Conclusion

Although there are some limitations in evaluating the malignancy of small lung tumors using 111In-DOTA-c(RGDfK), SPECT with 111In-DOTA-c(RGDfK) might be a useful non-invasive imaging approach for evaluating the characteristics of lung tumors in mice, thus showing potential for use in humans.

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Acknowledgments

This work was supported in part by a Grant-in-Aid for Exploratory Research and a Grant-in-Aid for Young Scientists (B) from the Ministry of Education, Culture, Sports, Science, and Technology as well as Grants-in-Aid for Cancer Research and for the Third-Term Comprehensive 10-Year Strategy for Cancer Control from the Ministry of Health, Labour and Welfare of Japan. The authors would like to thank Enago (http://www.enago.jp) for the English language review.

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The authors have no conflicts of interest to declare.

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Correspondence to Mitsuyoshi Yoshimoto.

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Hayakawa, T., Mutoh, M., Imai, T. et al. SPECT/CT of lung nodules using 111In-DOTA-c(RGDfK) in a mouse lung carcinogenesis model. Ann Nucl Med 27, 640–647 (2013). https://doi.org/10.1007/s12149-013-0729-1

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  • DOI: https://doi.org/10.1007/s12149-013-0729-1

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