Abstract
Azathioprine, an antitumor agent, was labeled with 99mTc using stannous chloride dihydrate as a reducing agent. Factors such as the amounts of the reducing agent and substrate, pH, and reaction temperature and time were systematically studied to determine the optimum conditions, under which the 95% radiochemical yield was achieved. Biodistribution studies demonstrate the suitability of 99mTc-azathioprine as a novel tracer for tumor imaging. It shows high selectivity to high-replicating solid tumors.
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