Myelofibrosis is a clonal neoplastic disorder of haematopoiesis , and is one of the diseases of the bone marrow in which excess cells are produced .
Myelofibrosis is a clonal neoplastic disorder of hematopoiesis , the formation of blood cellular components . 
 It is one of the myleoproliferative disorders , diseases of the bone marrow in which excess cells are produced .