Table 2.
Numbers of tryptase expressing (T+) and chymase expressing (C+) bone marrow (BM) mast cells (MC)/mm2 in the two main subtypes of mastocytosis and non-mastocytotic states (myelodysplasia/MDS and normal/reactive BM)
| T+ | C+ | |||||||||
| Max | 75th | Median | 25th | Min | Max | 75th | Median | 25th | Min | |
| ISM (n=29) | 5343 | 728 | 427 | 168 | 106 | 864 | 38 | 0 | 0 | 0 |
| ASM (n=18) | 2835 | 1321 | 808 | 304 | 160 | 993 | 36 | 4 | 0 | 0 |
| Normal BM (n=31) | 167 | 61 | 4 | 1 | 0 | 159 | 27 | 8 | 4 | 0 |
| MDS (n=28) | 493 | 53 | 32 | 7 | 2 | 46 | 4 | 0 | 0 | 0 |
25th and 75th refer to the 25th and 75th centile, respectively.
ASM, aggressive systemic mastocytosis; ISM, indolent systemic mastocytosis.