FIG 4.
Percentage of mast cell cellularity observed on bone marrow biopsy specimens correlated with serum tryptase levels for ISM. Data shown are for bone marrow biopsy specimens in which there was a tryptase level obtained at the time of biopsy (n = 32). Green circles indicate UP (n = 6), filled squares indicate DCM (n = 7), open squares indicate mastocytomas (n = 2), and triangles indicate ISM (n = 17). The 2 children with a nodular subtype did not have a bone marrow biopsy performed. Note that some data points superimpose. Correlation coefficient Spearman rho = 0.84 (P < .0001) for SM and Spearman rho = 0.41 (P = .363) for DCM. UP values are all 1% or less, with no correlation.