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Trastuzumab quantification in serum: a new, rapid, robust ELISA assay based on a mimetic peptide that specifically recognizes trastuzumab

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Abstract

Trastuzumab, a humanized monoclonal antibody directed against the epidermal growth factor receptor 2 (HER2), is a milestone in the treatment of HER2-overexpressing breast cancer patients. An enzyme-linked immunosorbent assay (ELISA) for trastuzumab has been developed for routine use in the laboratory to support clinical and pharmacokinetic studies to optimize therapy. The method relies on an antigen peptide linked to a 96-well plate via the streptavidin/biotin system. The peptide sequence mimics the extracellular portion of the HER2 receptor that is recognized by trastuzumab. The calibration range of the assay is 10 to 360 ng/mL per well, corresponding to a trastuzumab serum concentration from 5 to 180 μg/mL with a lower limit of quantification of 10 μg/mL. Validation results demonstrate that trastuzumab can be accurately and precisely quantified in human serum using this assay. The procedure was also tested in sera obtained from breast cancer patients to evaluate trastuzumab serum levels, confirming the applicability of method that could be a valid assay to use in daily laboratory practice.

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Abbreviations

BSA:

Bovine serum albumin

CV:

Coefficient of variation

ELISA:

Enzyme-linked immunosorbent assay

Fmoc:

9-Fluorenylmethoxycarbonyl

HER2:

Human epidermal growth factor receptor 2

IgG:

Gamma immunoglobulin

LLoD:

Lower limit of detection

LLoQ:

Lower limit of quantification

PBS:

Phosphate-buffered saline

pNPP:

p-Nitrophenyl phosphate

QC:

Quality control

ULoQ:

Upper limit of quantification

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Acknowledgments

The study was supported by AIFA (Italian Drug Agency) grant no. FARM6N78KN

Conflict of interest

All authors disclose no conflict of interest.

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Correspondence to Gianluigi Lunardi.

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Cardinali, B., Lunardi, G., Millo, E. et al. Trastuzumab quantification in serum: a new, rapid, robust ELISA assay based on a mimetic peptide that specifically recognizes trastuzumab. Anal Bioanal Chem 406, 4557–4561 (2014). https://doi.org/10.1007/s00216-014-7842-4

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  • DOI: https://doi.org/10.1007/s00216-014-7842-4

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