Stage Information for Chronic Myelogenous Leukemia
Bone marrow sampling is done to assess cellularity, fibrosis, and cytogenetics. The Philadelphia chromosome (Ph1) is usually more readily apparent in marrow metaphases than in peripheral blood metaphases; in some cases, it may be mashed and reverse transcriptase-polymerase chain reaction (RT-PCR) or fluorescent in situ hybridization analyses on blood or marrow aspirates may be necessary to demonstrate the 9;22 translocation.
Histopathologic examination of bone marrow aspirate demonstrates a shift in the myeloid series to immature forms that increase in number as patients progress to the blastic phase of the disease. The marrow is hypercellular, and differential counts of both marrow and blood show a spectrum of mature and immature granulocytes similar to that found in normal marrow. Increased numbers of eosinophils or basophils are often present, and sometimes monocytosis is seen. Increased megakaryocytes are often found in the marrow, and sometimes fragments of megakaryocytic nuclei are present in the blood, especially when the platelet count is very high. The percentage of lymphocytes is reduced in both the marrow and blood in comparison with normal subjects, and the myeloid/erythroid ratio in the marrow is usually greatly elevated. The leukocyte alkaline phosphatase enzyme is either absent or markedly reduced in the neutrophils of patients with chronic myelogenous leukemia (CML).
Routine cancer screening can save lives. It can also cause serious harm.
This is the "double-edged sword" of cancer screening, says Otis Webb Brawley, MD, chief medical officer at the American Cancer Society.
"Many of these cancers we treat and cure never needed to be treated and cured," Brawley says. "They are never going to kill that patient."
At the heart of the problem is our justifiable fear of cancer. The message has been drummed into us: Find cancers early while they're still curable and...
Transition from the chronic phase to the accelerated phase and later the blastic phase may occur gradually over a period of 1 year or more, or it may appear abruptly (blast crisis). The annual rate of progression from chronic phase to blast crisis is 5% to 10% in the first 2 years and 20% in subsequent years.[2,3] Signs and symptoms commonly indicating such a change include the following: