This paper describes an RQ-PCR assay for the detection of ZAP-70 expression and confirms that IgV(H) unmutated CLL cells have a high expression of ZAP-70 in comparison with IgVH mutated CLL. This robust method acts as a surrogate marker for IgVH mutational status albeit with <100% concordance. However, it does provide better concordance with mutational status than that reported using flow cytometry.
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