Comparison between single saturating dose ligand binding assay and enzyme immunoassay for low-salt extractable oestrogen and progesterone receptors in breast cancer: A multicentre study

Massimo Gion, Ruggero Dittadi, Antonette E. Leon, Giuliano Bruscagnin, Dario Pelizzola, Gloria Giovannini, Melchiorre Giganti, Gianni Messeri, Massimo Quercioli, Emanuela Flamini, Angela Riccobon, Cecilia Bozzetti, Magda Benecchi, Mario De Lena, Angelo Paradiso, Giuseppina Ruggeri, Patrizia Luisi, Adriano Piffanelli

Research output: Contribution to journalArticle

Abstract

An excellent correlation between ligand binding assay (LBA) and enzyme immunoassay (EIA) for both oestrogen (ER) and progesterone (PR) receptors has been reported. Nevertheless, considering that the clinical value of any discrepancy between LBA and EIA probably varies with the receptor level, we undertook a collaborative study in which a single saturating dose (SSD) LBA and EIA were compared in different ER and PR dose ranges. The values of ER measured by EIA were higher in tumours with low or intermediate receptor content, causing a misclassification of ER status in 9% of cases (ER+: 77.5%, EIA, 68.8% SSD). In the case of ER, EIA values tended to be higher than SSD in all centres. For PR, EIA and SSD were generally more comparable (PR+: 66.0% EIA, 72.0% SSD, discordance rate 6%), with EIA showing, however, different trends in different centres. PR concentration was not significantly different in ER SSD-/EIA+ and in ER SSD+/EIA+ cases, suggesting that EIA detects at least in part integer ER. We conclude that although EIA may be a reliable methodological alternative to SSD, the two methods are not interchangeable until effective cut-off levels for clinical decisions are assessed for EIA.

Original languageEnglish
Pages (from-to)996-1002
Number of pages7
JournalEuropean Journal of Cancer and Clinical Oncology
Volume27
Issue number8
DOIs
Publication statusPublished - 1991

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ASJC Scopus subject areas

  • Oncology
  • Cancer Research

Cite this

Gion, M., Dittadi, R., Leon, A. E., Bruscagnin, G., Pelizzola, D., Giovannini, G., Giganti, M., Messeri, G., Quercioli, M., Flamini, E., Riccobon, A., Bozzetti, C., Benecchi, M., De Lena, M., Paradiso, A., Ruggeri, G., Luisi, P., & Piffanelli, A. (1991). Comparison between single saturating dose ligand binding assay and enzyme immunoassay for low-salt extractable oestrogen and progesterone receptors in breast cancer: A multicentre study. European Journal of Cancer and Clinical Oncology, 27(8), 996-1002. https://doi.org/10.1016/0277-5379(91)90267-H