Tissue Polypeptide Specific Antigen

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

**Definition:** An antigenic dimeric combination of intermediate filament Keratin 8 and Keratin 18 peptides, K8/K18, which is detectable in serum and is being investigated as a cancer marker.

**Synonyms:** - K8/K18 - Keratin 8/Keratin 18 - TPS