KIT and mastocytosis: The course of pregnancies correlated with chosen parameters of mastocytosis: percentage of atypical MCs in bone marrow smear (mean 2,95% ± 5,7), serum tryptase levels (mean 27,7 ± 6,3 ng/ml), detection of c-kit somatic mutations (26,7%) and KIT D816V mutation (6,7%), CD25 (94,1%) and CD2 (94,1%) expression, are presented in Table 2.