Quantitation of IgG and IgM Human Anti-Mouse Antibodies (HAMA) Interference in CA 125 Measurements Using Affinity Chromatography
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Norbert P. Koper
Abstract
Currently no available immunoassay system offers complete protection against spuriously elevated or lowered results due to interference by Human Anti-Mouse Antibodies (HAMA). Although routine use of chromatography procedures is not an acceptable option because of the extra cost and workload involved, such a procedure would be highly desirable to ensure accurate immunoassay results. The present report describes a relatively simple affinity chromatography procedure using a HiTrap Protein G column to isolate immunoglobulin G (IgG) HAMA, followed by a HiTrap N-hydroxy-succinimide(NHS)-activated column coupled to goat-anti human immunoglobulin M (IgM) to bind IgM HAMA. To examine the usefulness of this purification procedure we determined CA 125 in forty serum samples prior to and following chromatography. Pre- and post-injection samples were obtained from 20 patients injected with 1 mg of 111In-Iabelled murine OC 125 F(ab′)2 fragments in an immunoscintigraphy study.
It is shown that this analytical procedure provides a technique to determine the extent and the nature of the existing HAMA interference in samples of patients after in vivo use of monoclonal antibodies for diagnostic or therapeutic purposes. The procedure can also contribute to the clarification of clinically discordant CA 125 results. Finally, the availability of such a procedure in the clinical laboratory provides an opportunity to test the robustness of newly developed immunoassay systems towards HAMA interference.
Copyright © 1998 by Walter de Gruyter GmbH & Co. KG
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Artikel in diesem Heft
- Editorial
- Predictive Medicine
- Standardization and Clinical Management of Lipoprotein(a) Measurements
- Evaluation of the Iron Status of the Newborn by Soluble Transferrin Receptors in Serum
- Quantitation of IgG and IgM Human Anti-Mouse Antibodies (HAMA) Interference in CA 125 Measurements Using Affinity Chromatography
- Neopterin Plasma Concentrations Predict the Course of Severe Acute Pancreatitis
- Objectives, Design and Recruitment of a Familial and Longitudinal Cohort for Studying Gene-Environment Interactions in the Field of Cardiovascular Risk: The Stanislas Cohort
- Total Carbon Dioxide Measured by the Vitros Enzymatic Method
- Evaluation of Glucocard Memory 2 and Accutrend® Sensor Blood Glucose Meters
- Evaluation of Circulating Type I Procollagen Propeptides in Patients with Paget's Disease of Bone
- Properties and Units in the Clinical Laboratory Sciences XIII. Properties and Units in Reproduction and Fertility
- Procalcitonin as a Specific Marker of Bacterial Infection in Adults
- Biological Variation and Quantification of Health: The Emergence of the Concept of Normality
