SELL and neoplasm: There were significantly lower frequencies of NK cells expressing the adhesion molecule L-selectin in the omentum (n = 17) and tumour (n = 7) of OAC patients, compared to the circulation (n = 18); blood vs. omentum (54.43% vs. 21.24%, p < 0.0001), blood vs. tumour (54.43% vs.23.02%, p = 0.0012) (Figure 4E).