technetium Tc 94m sestamibi
Cancer
(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.