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Nude mice are important in vivo model for characterization of cell malignancy behavior;however,many cancer cells fail to form tumors in it.Understanding this defective mechanism may provide novel insights into tumorigenesis and how tumor cells escape innate immunity.Whole-genome sequencing was conducted on two gastric cancer (GC) cells, BGC823 and AGS,which do and do not form tumors in nude mice, to identify their genomic differences relevant to natural killer (NK) cells.