FCER1A and Nasal polyposis: As it is described that the concentration of IgE is related[12] to the surface expression of FcεRI, and IgE concentrations are significantly higher in nasal polyps compared to controls [17], we studied the correlation between the IgE levels in tissue homogenates, and the release of histamine, LTC4/LTD4/LTE4 and PGD2 after anti-IgE challenge.