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technetium Tc 94m sestamibi (tek-NEE-shee-um … SES-tuh-MIH-bee)
|A substance being studied in certain cancer-imaging tests using positron emission tomography (PET). It contains a radioactive substance called technetium, bound to another substance called sestamibi, that helps it enter cells. It may help show how well cancer cells take up anticancer drugs. It is a type of radiopharmaceutical.|