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Poster presentation 1

794 - Overexpression of NK cell-activating ligand MICA/B correlates with superior outcomes and might be a therapeutic target for chemo-immunotherapy in non-small-cell lung cancer


19 Dec 2015


Poster presentation 1


Riki Okita


Annals of Oncology (2015) 26 (suppl_9): 148-152. 10.1093/annonc/mdv533


R. Okita, T. Yukawa, Y. Nojima, A. Maeda, S. Saisho, K. Shimizu, M. Nakata

Author affiliations

  • General Thoracic Surgery, Kawasaki Medical School, 701-0192 - Kurashiki/JP


Abstract 794


MICA and MICB (MICA/B) are the NK group 2 member D (NKG2D) ligands that are broadly expressed in transformed cells and promote natural killer (NK) cell-mediated cytotoxicity via NKG2D–NKG2D ligand interaction. NKG2D ligand overexpression has been recently reported to correlate with good prognosis in different types of cancer, however, the prognostic significance of MICA/B expression in NSCLC tissue has never been reported.


MICA/B expression was evaluated by immunohistochemistry in 91 consecutive NSCLC patients after radical surgery; the clinicopathological features as well as clinical outcome were also analyzed. Additionally, MICA/B expressions as well as NK cell-mediated cytotoxicity in NSCLC cell line A549 treated with chemotherapeutic regents were assessed by flowcytoetric analysis and LDH release assay, respectively.


Overall, 28 of 91 (30.8%) specimens overexpressed MICA/B. The MICA/B overexpression was associated with low F18-fluorodeoxyglucose (FDG) uptake and adenocarcinoma histology. After a median follow-up of 48.2 months, MICA/B overexpression was associated with good recurrence-free survival (RFS) (p = 0.037). In multivariate analysis, MICA/B overexpression emerged as an independent prognostic factor for RFS (p = 0.046). In vitro assay, chemotherapeutic reagents upregulated MICA/B expression via ATM-ATR pathway, resulted in enhanced NK cell-mediated cytotoxicity in A549 cells.


MICA/B overexpression in patients with radically resected NSCLC is predictive of good prognosis, and chemotherapeutic regent enhances NK cell-mediated cytotoxicity via upregulation of MICA/B.

Clinical trial identification


M. Nakata: research fundings from Kyowa-Kirin, Eli Lilly Japan and CSL Behring. All other authors have declared no conflicts of interest.

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