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Optimizing [99mTc]Tc-Tamsulosin for Enhanced Tumor Detection: A Comprehensive Approach from Preparation to In Vivo
M H Sanad1, Safaa B Challan1,2, A Massoud3
1Labeled Compounds Department, Hot Laboratories and Waste Management Center, Egyptian Atomic Energy Authority, P.O. Box 13759, Cairo, Egypt.
Nuclear Medicine and Molecular Imaging
|June 11, 2026
Summary
Technetium-99m labeled Tamsulosin hydrochloride demonstrates high tumor uptake and stability, showing promise as a novel radiopharmaceutical for enhanced cancer imaging in nuclear medicine oncology.
Area of Science:
- Nuclear Medicine
- Radiopharmaceutical Chemistry
- Oncology
Background:
- Tamsulosin hydrochloride is a selective α1-adrenoceptor antagonist.
- Development of novel radiopharmaceuticals is crucial for improving tumor imaging and diagnostic accuracy.
Purpose of the Study:
- To investigate Tamsulosin hydrochloride labeled with Technetium-99m ([⁹⁹ᵐTc]) as a tumor-targeting ligand.
- To develop and evaluate the [⁹⁹ᵐTc]Tc-Tamsulosin complex for enhanced tumor imaging.
Main Methods:
- Optimized radiolabeling of tamsulosin with [⁹⁹ᵐTc].
- Assessed radiochemical yield and in vitro stability using TLC.
- Purified the complex via electrophoresis and HPLC.
- Evaluated in vivo performance in tumor-bearing and normal mice.
Main Results:
- Achieved high radiochemical purity (>97.5%) and in vitro stability (>87% after 24h).
- Demonstrated significant tumor uptake (5.2% ID/g) with a favorable target-to-non-target ratio (5.3).
- Observed prominent renal clearance and urinary excretion.
Conclusions:
- The [⁹⁹ᵐTc]Tc-Tamsulosin complex exhibits high efficiency, stability, and selective tumor accumulation.
- Supports its potential as a novel radiopharmaceutical for accurate tumor imaging in oncology.
- Highlights its value in advancing nuclear medicine diagnostics.
