Chronic myelomonocytic leukemia is a type of blood and bone marrow cancer in which the bone marrow makes too many abnormal blood cells, including monocytes (a type of white blood cell). The monocytes may also have an abnormal shape or size (dysplastic).
Graft versus host disease (GVHD) is a common complication of a stem cell/bone marrow transplant. It happens when the donor's immune cells, now in the patient, begin to see the patient's body as foreign, triggering an immune response to attack.
Myelofibrosis is a bone marrow disorder where the marrow is replaced with fibrous scar tissue. It can lead to low blood cell counts and an enlarged spleen. It is considered a myeloproliferative neoplasm (MPN).
Chronic myeloproliferative neoplasms are a group of diseases in which the bone marrow makes too many red cells, white cells or platelets. There are six different type of MPNs.