Open AccessDevelopment of two ELISA for estrogen and progesterone receptor with sufficient sensitivity for fine needle aspirate and core biopsy
Author(s) -
Sun C.F.,
Wu T.L.,
Tsao K.C.,
Wu J.T.
Publication year - 2001
Publication title -
journal of clinical laboratory analysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.536
H-Index - 50
eISSN - 1098-2825
pISSN - 0887-8013
DOI - 10.1002/jcla.1017
Subject(s) - cytosol , estrogen receptor , core biopsy , breast cancer , estrogen , receptor , progesterone receptor , medicine , biopsy , hormone receptor , chemistry , pathology , cancer , enzyme , biochemistry
The quantitative determination of estrogen and progesterone receptors (PR and ER) in breast tumor cytosol has been routinely performed in clinical laboratories to aid in the selection between hormonal and chemotherapy and also to predict prognosis. However, the small amount of tissue available from the increasingly popular fine‐needle aspiration and core biopsies from breast cancer patients requires more sensitive immunoassays for receptor quantification. We have developed two sensitive immuno‐assays for ER and PR on microplate with the use of recently available anti‐ER and anti‐PR antibodies of higher affinity and a powerful signal magnification agent, namely Amdex. The calibrator was a pooled breast tumor cytosol used as calibrator and calibrated against Abbott kits. The protein concentration of the cytosol and the upper normal cutoffs for our assays were reduced to approximately 0.2 mg/mL and 3 fmol/0.2 mg/mL, respectively. Both assays have sensitivities close to 1 fmol/mL, which are sufficiently sensitive for the receptor quantification in fine‐needle aspiration biopsies and cord biopsies of breast tumor. J. Clin. Lab. Anal. 15:138–143, 2001. © 2001 Wiley‐Liss, Inc.