851 school children aged at 12-13 years including 145 with eczema were
tested for genetic association to a mast cell chymase (MCC) genetic v
ariant. MCC genotypes showed a strong association with eczema, but not
with asthma and rhinitis. This association is strongest in eczematous
children with lower serum total IgE levels, Independent of IgE respon
siveness when total serum IgE of less than 500 IU/ml, MCC variants may
play an important role in inflammatory skin disorders.