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Vol. 28, No. 5, 2007
Issue release date: November 2007
Section title: Research Article
Tumor Biol 2007;28:253–263
(DOI:10.1159/000110898)

Quantification of CD44v6 and EGFR Expression in Head and Neck Squamous Cell Carcinomas Using a Single-Dose Radioimmunoassay

Nestor M. · Ekberg T. · Dring J. · van Dongen G.A.M.S. · Wester K. · Tolmachev V. · Anniko M.
aUnit of Otolaryngology and Head and Neck Surgery, Department of Surgical Sciences, and bUnit of Biomedical Radiation Science, Department of Oncology, Radiology and Clinical Immunology, Uppsala University, Uppsala, Sweden; cDepartment of Otolaryngology/Head and Neck Surgery, Free University Medical Center, Amsterdam, The Netherlands

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Article / Publication Details

First-Page Preview
Abstract of Research Article

Received: 3/26/2007
Accepted: 6/15/2007
Published online: 11/9/2007

Number of Print Pages: 11
Number of Figures: 6
Number of Tables: 2

ISSN: 1010-4283 (Print)
eISSN: 1423-0380 (Online)

For additional information: http://www.karger.com/TBI

Abstract

Background: In the growing field of tumor targeting, there is an urgent need to profile suitable molecular targets. In this study, CD44v6 and EGFR expression was quantified in samples of patients with head and neck squamous cell carcinoma (HNSCC) using a single-dose (SD) radioimmunoassay. Methods: The SD radioimmunoassay using 125I-chimeric monoclonal antibody (cMAb) U36 and 125I-cMAb cetuximab was first validated and then applied to quantify the expression of their target antigen molecules, CD44v6 and EGFR, in patient samples. Results were compared to immunohistochemical staining. Results: The SD assay provided sensitive quantitative values of the molecular targets studied, generally agreeing with the immunohistochemistry (IHC) results. The results indicated that expression of CD44v6 (0.2–20 nmol/µg membrane) was generally higher than that of EGFR (0.6–2.3 nmol/µg membrane) in the tumor samples analyzed, which corresponded to an average of 700,000 and 90,000 antigen molecules per cell, respectively. Conclusions: The SD radioimmunoassay is simple, reliable, and can be performed on a small amount (50 mg) of tissue. This assay could be a useful tool in the growing field of personalized cancer therapy, and can be used as a complement to IHC. In the tumors studied, CD44v6 was generally expressed at a higher level than EGFR, which might suggest that it could be more readily targeted by MAbs.


Article / Publication Details

First-Page Preview
Abstract of Research Article

Received: 3/26/2007
Accepted: 6/15/2007
Published online: 11/9/2007

Number of Print Pages: 11
Number of Figures: 6
Number of Tables: 2

ISSN: 1010-4283 (Print)
eISSN: 1423-0380 (Online)

For additional information: http://www.karger.com/TBI


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Drug Dosage: The authors and the publisher have exerted every effort to ensure that drug selection and dosage set forth in this text are in accord with current recommendations and practice at the time of publication. However, in view of ongoing research, changes in goverment regulations, and the constant flow of information relating to drug therapy and drug reactions, the reader is urged to check the package insert for each drug for any changes in indications and dosage and for added warnings and precautions. This is particularly important when the recommended agent is a new and/or infrequently employed drug.
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