Table 1.

Numbers of tryptase expressing (T+) and chymase expressing (C+) bone marrow (BM) mast cells/mm² in mastocytosis, myelodysplastic syndromes (MDS), and normal/reactive BM

	T+					C+
	Max	75th	Median	25th	Min	Max	75th	Median	25th	Min
Mastocytosis (n=47)	5343	1113	446	254	106	993	38	0	0	0
MDS (n=28)	493	53	32	7	2	46	4	0	0	0
Normal BM (n=31)	167	61	4	1	0	159	27	8	4	0

25th and 75th refer to the 25th and 75th centiles, respectively.