Fluorothymidine F 18. Definition

Medical Definition: Fluorothymidine F 18

A radioactive substance being studied in the diagnosis of cancer. The fluorothymidine F 18 is injected into the blood and accumulates in cells that are dividing, including cancer cells. The radiation it gives off as it decays (breaks down) helps make clear pictures of tumors during scans by positron emission tomography (PET). It is a type of radiopharmaceutical. Also called 18F-FLT and 3'-deoxy-3'-(18F) fluorothymidine.

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