Steroid receptor assays: an Italian quality assessment program

Area of Science:

• Biochemistry
• Oncology
• Clinical Chemistry

Background:

• Established in 1979, the Italian Committee for quality assessment of steroid receptor assays saw significant growth, expanding from 7 to 43 participating laboratories by 1989.
• The program collaborated with the European Organization for Research and Treatment of Cancer (EORTC) to establish standardized protocols.

Purpose of the Study:

• To standardize steroid receptor assay methods across Italian laboratories.
• To ensure consistent and reliable quantification of hormone receptors for cancer patient management.

Main Methods:

• Utilized lyophilized samples as working standards, stable for prolonged storage at 4°C.
• Adopted the dextran-coated charcoal (DCC) method for steroid receptor measurement, specifying identical radioactive ligands and non-specific binding compounds.
• Employed multipoint Scatchard analysis for data computation, acknowledging its complexity but widespread use.

Main Results:

• Demonstrated excellent correlation between the established radioligand binding assay (DCC) and newer immunochemical assay (EIA) methods.
• Highlighted the importance of standardized methods for reliable hormone receptor quantification in human cancer.
• Identified estrogen receptor status and other prognostic factors as key determinants of cancer recurrence.

Conclusions:

• Standardized DCC method is a recognized procedure for hormone receptor quantification.
• Quality assessment programs are crucial with the advent of new technologies like EIA.
• Estrogen receptor status and other molecular markers are critical for predicting cancer recurrence.