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.
- SSTR2-targeting protein/DM1 conjugate PEN-221
A miniaturized drug conjugate composed of a peptide analog of somatostatin that targets the somatostatin receptor 2 (SSTR2) and is conjugated, through a cleavable linker, to the microtubule-binding cytotoxic maytansinoid DM1 (mertansine), with potential anti-tumor activity. Upon administration, the peptide ligand moiety of PEN-221 targets and binds to SSTR2, which is overexpressed on certain tumor cell types. Binding stimulates SSTR2-mediated endocytosis of the agent; upon internalization, the DM1 moiety is released and binds to tubulin, thereby disrupting microtubule assembly/disassembly dynamics. This inhibits both cell division and the proliferation of SSTR2-expressing cancer cells. Compared to antibody-drug conjugates (ADCs), miniaturized drug conjugates are much smaller and can more easily penetrate and distribute in dense tumor tissue. Check for active clinical trials using this agent. (NCI Thesaurus)
Synonym: SSTR2PEN-221 Code name: BTP-277