IL4 and breast angiosarcoma: Therewas a concordance of the clinical classification of BA severity with the ‘genotype’(McNemar’s χ2 test with continuity correction constituted 0.03, d.f. = 1, p = 0.859).These results suggest that polymorphisms in the IL4 and IL5 genes contribute to thesusceptibility to atopic BA and could determine the clinical course of the disease.