This could be possibly explained by the usage of different markers: CD56+ (a marker of a large majority of NK cells, especially early-responding iNKT cells) in the studies that found increased NK cell infiltration [54,55,62,71,81] and CD57+ (which refers to the more mature phenotype of NK cells) in the survey with a tendency for a decrease in the late carcinoma stage [79]. The gene discussed is NCAM1; the disease is carcinoma.