NCI Drug Dictionary

The NCI Drug Dictionary contains technical definitions and synonyms for drugs/agents used to treat patients with cancer or conditions related to cancer. Each drug entry includes links to check for clinical trials listed in NCI's List of Cancer Clinical Trials.

technetium Tc 99m hydroxydiphosphonate
A radioconjugate containing hydroxydiphosphonate (HDP) labeled with the metastable radioisotope technetium Tc (99mTc), with radioimaging activity. Upon intravenous administration, skeletal uptake of technetium Tc-99m HDP occurs as a function of skeletal blood flow and osteogenic activity. HDP has a specific affinity for hydroxyapatite crystals in bone where abnormal accumulation of increased osteoid mineralization has occurred. Labeling of HDP with 99mTc allows gamma scintigraphic imaging of areas of abnormal osteogenesis associated with malignant bone lesions. Check for active clinical trials using this agent. (NCI Thesaurus)

Abbreviation:99mTc HDP
Tc-99m hydroxydiphosphonate