Journal of Medical Physics
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Year : 2022  |  Volume : 47  |  Issue : 2  |  Page : 194-200

Human absorbed dose estimation of 111In-DOTA-PR81 as a novel high potential agent for breast cancer imaging

Radiation Application Research School, Nuclear Science and Technology Research Institute, Tehran, Iran

Correspondence Address:
Dr. Behrouz Alirezapour
Radiation Application Research School, Nuclear Science and Technology Research Institute, Tehran
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Source of Support: None, Conflict of Interest: None

DOI: 10.4103/jmp.jmp_72_21

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Purpose: In this study, the human absorbed dose of 111In-DOTA-PR81 as a new radioimmunoconjugate for single-photon emission computed tomography (SPECT) imaging of MUC1 + breast cancer was determined. Materials and Methods: The complex was prepared at optimized conditions in about 1 h and 38°C. The radiochemical purity of the tracer was investigated using the instant thin-layer chromatography method method, showing purity of higher than 96%. After evaluating the stability of the product in human serum and room temperature, the biological distribution of the radiolabeled compound was studied in normal rats and tumor-bearing mice. Finally, the human absorbed dose of the complex was estimated based on animals' data using radiation dose assessment resource and Spark et al. methods. Results: High uptake of the complex in MUC1 + breast tumors compared to other nontarget organs shows that the radioimmunoconjugate is a beneficial agent for SPECT imaging of MUC1 + breast cancer. Human organs absorbed dose estimation of the complex demonstrated the highest amounts of the absorbed dose are in the liver and kidneys with 0.384 and 0.245 mGy/MBq, respectively. Conclusions: 111In-DOTA-PR81 radioimmunoconjugate is a high potential agent for MUC1 + breast cancer SPECT imaging and estimated absorbed dose values could helpfully use for the determination of the maximum injectable dose.

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