Myeloid leukemia is a form of cancer where the bone marrow makes too many myeloid cells (granulocytes and their precursors) in the bone marrow which accumulates in the blood and eventually invades various parts of the body. The chronic phase of myeloid leukemia usually involves few if any symptoms. This is the early stage of the disease and without treatment it generally progresses to the accelerated phase of the condition. The majority of patients diagnosed with myeloid leukemia are diagnosed during the chronic phase. See also Leukemia, Myeloid, Chronic-Phase