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Substance Name: Lymphoseek
RN: 746637-33-2


  • NCI: 99mTc-DTPA-mannosyl-dextran A radiolabeled macromolecule consisting of the chelating agent diethylenetriamine pentaacetic acid (DTPA) and mannose each attached to a dextran backbone and labeled with metastable technetiumTc-99 (Tc-99m), with mannose binding and radioisotopic activities. Upon injection, the mannose moiety of 99mTc-DTPA-mannosyl-dextran binds to mannose-binding protein (MBP). As MBPs reside on the surface of dendritic cells and macrophages, this gamma-emitting macromolecule tends to accumulate in lymphatic tissue where it may be imaged using gamma scintigraphy. This agent exhibits rapid clearance from the injection site, rapid uptake and high retention within the first draining lymph node, and low uptake by the remaining lymph nodes. MBP is a C-type lectin that binds mannose or fucose carbohydrate residues, such as those found on the surfaces of many pathiogens, and once bound activates the complement system. Check for active clinical trials or closed clinical trials using this agent. (NCI Thesaurus)

Molecular Formula

  • Unspecified
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Links to Resources

Names and Synonyms

Name of Substance

  • Lymphoseek


  • Tc99m tilmanocept
  • Tilmanocept

Systematic Names

  • Lymphoseek
  • Technetium Tc 99m tilmanocept

Registry Numbers

CAS Registry Number

  • 746637-33-2

System Generated Number

  • 0746637332