| HR | histamine receptor |
| IgE | immunoglobulin E |
| MCAS | mast cell activation syndrome |
| PGD2 | prostaglandin D2 |
| GI tract | gastrointestinal tract; UVA, ultraviolet light |
| AHN | associated hematologic (non-mast cell) neoplasm |
| ASM | aggressive systemic mastocytosis |
| MCL | mast cell leukemia |
| IFN-A | interferon-alpha |
| HSCT | hematopoietic stem cell transplantation |
| HU | Hydroxyurea |
| BSC | best supportive care |
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