FCGRT and carcinoma: There are evidences showing that FcRn is expressed in normal human epidermal keratinocytes22and intestinal epithelial cells.23Fc gamma receptors also express in human nasal epithelial cells24and carcinoma cells.25It was shown that rabbit IgG could bind to human Fc gamma receptor.26If H357 cells have Ig Fc receptor on cell surface, anti-FimI Ig internalization after coincubation might be modified by this receptor.