NCAM1 and neoplasm: However we noted that the lymphocyte population within the tumour was substantially different from the background liver, with an increased frequency of T cells (61.8% vs 37.4% p = 0.0008) and a depressed frequency of NK cells (12.9% vs 38.3% p = 0.0048) and CD56+ T cells (6.7% vs 13.1% p =0.03).