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Soluble MICA in malignant diseases
Author(s) -
Holdenrieder Stefan,
Stieber Petra,
Peterfi Andrea,
Nagel Dorothea,
Steinle Alexander,
Salih Helmut Rainer
Publication year - 2005
Publication title -
international journal of cancer
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.475
H-Index - 234
eISSN - 1097-0215
pISSN - 0020-7136
DOI - 10.1002/ijc.21382
Subject(s) - immunosurveillance , nkg2d , cd8 , mhc class i , natural killer cell , major histocompatibility complex , cancer research , cancer , immune system , stage (stratigraphy) , metastasis , immunology , chemistry , biology , cytotoxic t cell , medicine , in vitro , biochemistry , paleontology
The immunoreceptor NKG2D activates natural killer cells and costimulates CD8 T cells. The MHC class I–related MICA molecules are ligands of NKG2D and are expressed on malignant, but not on normal, cells. As NKG2D plays an important role in the immunosurveillance of tumors, studies suggest that release of MICA from cancer cells constitutes an immune escape mechanism that systemically impairs antitumor immunity. Here, we investigated the potential of soluble MICA (sMICA) as a marker in cancer. Analysis of sMICA in sera of 512 individuals revealed significantly ( p < 0.0001) higher levels in patients with various malignancies ( n = 296, median 161 pg/ml) than in healthy individuals ( n = 62, median <30 pg/ml). Patients with benign diseases ( n = 154, median 84 pg/ml) exhibited intermediate sMICA levels. In cancer patients, elevated sMICA levels correlated significantly with cancer stage and metastasis ( p = 0.015 and p = 0.007, respectively). While release of MICA is thought to impair tumor immunity, determination of sMICA levels may provide useful additional information in the diagnosis and staging of cancer. © 2005 Wiley‐Liss, Inc.