Two-site ELISA for the quantitative determination of fatty acid synthase

Clin Chim Acta. 2001 Feb;304(1-2):107-15. doi: 10.1016/s0009-8981(00)00404-6.


Fatty acid synthase (FAS) is an enzyme which plays a central role in the de novo biosynthesis of fatty acids. FAS is selectively expressed in certain human cancers and therefore is a putative tumor marker. We developed an enzyme-linked immunosorbent assay (ELISA) for measuring FAS, and investigated its expression and clinical features. In this two-site sandwich ELISA, a polyclonal antibody was used as a capture on Nunc MaxiSorp ELISA/EIA modules and a monoclonal antibody labeled with biotin was used as a signal antibody. The assay was linear with no cross-reactivity with other tumor markers. The within- and between-run CVs were <10%, and the detection limit was 0.15 arbitrary Units/l. Recoveries were 92.4-105.1%. FAS was stable in buffer at 4 degrees C for more than 10 days and stable at 37 degrees C for 2 days. In human serum, FAS levels were significantly higher in patients with breast (1.01+/-0.71 Units/l, mean+/-S.D.), prostate (0.79+/-0.76 Units/l), colon (0.89+/-0.49 Units/l), and ovarian (0.84+/-0.9 Units/l) cancers compared to normal subjects (0.27+/-0.09 Units/l, P<0.01). This assay is sensitive, accurate, and precise and can distinguish between patients with various types of cancer and normal subjects.

MeSH terms

  • Adult
  • Aged
  • Aged, 80 and over
  • Antibodies, Monoclonal
  • Enzyme-Linked Immunosorbent Assay / methods*
  • Evaluation Studies as Topic
  • Fatty Acid Synthases / blood*
  • Fatty Acid Synthases / immunology
  • Female
  • Humans
  • Male
  • Middle Aged
  • Neoplasms / blood
  • Neoplasms / enzymology
  • Sensitivity and Specificity


  • Antibodies, Monoclonal
  • Fatty Acid Synthases