EF-1 Peptide

**Semantic type:** Amino Acid, Peptide, or Protein|Pharmacologic Substance

**Definition:** A synthetic peptide derived from the protein ESW/FLI1 type 1 with potential use in cancer immunotherapy. EWS/FLI1 is a fusion protein frequently found in patients with Ewing's sarcoma or primitive neuroectodermal tumors (PNET). Vaccination with EF-1 peptide may stimulate the host immune response to elicit a cytotoxic T-cell response against tumor cells that express this EWS/FL1 type 1 fusion protein.

**Synonyms:** - EWS/FLI 1 (type 1) - EWS/FLI 1 Type 1