Difference in sero-diagnostic values among KL-6-associated mucins classified as cluster 9

Int J Cancer Suppl. 1994;8:81-3. doi: 10.1002/ijc.2910570717.


KL-6 classified as Cluster 9 (MUC-I) is a circulating high-molecular-weight mucin-like molecule. Serum level of KL-6 was measured by a sandwich assay using KL-6 antibody as not only a catcher but also as a tracer. We established 2 additional monoclonal antibodies (MAbs), LISA 101 and EH-123, reacting with KL-6 epitopes different from the epitope recognized by KL-6 antibody. The KL-6-associated mucins detected by the sandwich assay using LISA 101 or EH-123 antibody as a catcher and KL-6 antibody as a tracer were designated as LISA 1-6 and CAM 123-6 respectively. The diagnostic values as the serum markers of KL-6, LISA 1-6 and CAM 123-6 were evaluated measuring their levels in the same serum from healthy individuals and from patients with pulmonary, pancreatic and breast adenocarcinomas. KL-6 was increased abnormally at high rates of more than 50% in pancreatic cancer and in benign lung diseases, LISA 1-6 only in pancreatic cancer, and CAM 123-6 only in pulmonary adenocarcinoma. In benign lung diseases, however, LISA 1-6 and CAM 123-6 were increased abnormally at the rates of only 5.3% and 0% respectively. These observations clearly indicate that LISA 1-6 and CAM 123-6 constitute a part of KL-6, but that they are superior to KL-6 as tumor markers for pancreatic cancer and for pulmonary adenocarcinoma respectively, because of their much lower false-positive rates.

Publication types

  • Comparative Study
  • Research Support, Non-U.S. Gov't

MeSH terms

  • Adenocarcinoma / blood
  • Adenocarcinoma / diagnosis*
  • Antigens / blood*
  • Antigens, Neoplasm
  • Biomarkers, Tumor / blood*
  • Breast Neoplasms / blood
  • Breast Neoplasms / diagnosis*
  • Diagnosis, Differential
  • Enzyme-Linked Immunosorbent Assay
  • Female
  • Glycoproteins / blood*
  • Humans
  • Lung Diseases / blood
  • Lung Neoplasms / blood
  • Lung Neoplasms / diagnosis*
  • Mucin-1
  • Mucins / blood*
  • Pancreatic Neoplasms / blood
  • Pancreatic Neoplasms / diagnosis*
  • Reference Values


  • Antigens
  • Antigens, Neoplasm
  • Biomarkers, Tumor
  • Glycoproteins
  • MUC1 protein, human
  • Mucin-1
  • Mucins