Soluble MICB in malignant diseases: analysis of diagnostic significance and correlation with soluble MICA

Cancer Immunology, Immunotherapy : CII
Stefan HoldenriederHelmut Rainer Salih

Abstract

Expression of ligands of the immunoreceptor NKG2D such as MICA and MICB has been proposed to play an important role in the immunosurveillance of tumors. Proteolytic shedding of NKG2D ligands from cancer cells therefore constitutes an immune escape mechanism impairing anti-tumor reactivity by NKG2D-bearing cytotoxic lymphocytes. Serum levels of sMICA have been shown to be of diagnostic significance in malignant diseases of various origins. Here, we investigated the potential of soluble MICB, the sister molecule of MICA, as a marker in cancer and its correlation with soluble MICA. Analysis of MICB in sera of 512 individuals revealed slightly higher MICB levels in patients with various malignancies (N = 296; 95th percentile 216 pg/ml; P = 0.069) than in healthy individuals (N = 62; 95th percentile 51 pg/ml). Patients with benign diseases (N = 154; 95th percentile 198 pg/ml) exhibited intermediate MICB levels. In cancer patients, elevated MICB levels correlated significantly with cancer stage and metastasis (P = 0.007 and 0.007, respectively). Between MICB and MICA levels, only a weak correlation was found (r = 0.24). Combination of both markers resulted only in a slightly higher diagnostic power in the high specificity range. The ...Continue Reading

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