Chronic Myeloid Leukemia: A Handbook for Hematologists and Oncologists
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The CML cells grow and survive better than normal cells. As a result, the number of healthy blood cells red cells, white cells and platelets is usually lower than normal. The Ph chromosome is the result of a translocation between chromosomes 22 and 9. For most people who have chronic myeloid leukemia CML , there are no obvious reasons why they develop the disease.
No one is born with CML. It happens when there is an injury to the DNA of a single bone marrow cell. Few risk factors are associated with CML. Two known risk factors are:. However, most people treated for cancer with radiation don't develop CML. And most people with CML were never exposed to high-dose radiation. The proportion of people who are exposed to radiotherapy and develop CML is small.
Research hasn't shown any association between dental or medical x-rays and CML. You can't catch CML from someone else. Reviewed by Neil P. Shah, MD, PhD.
Chronic Myeloid Leukemia. Print Glossary. Chronic myeloid leukemia CML Is a cancer of the bone marrow and blood. CML is usually diagnosed in its chronic phase when treatment is very effective for most patients. What You Should Know CML is also called chronic myelogenous leukemia, chronic granulocytic leukemia, and chronic myelocytic leukemia.
A number of clinical prognostic scales have been developed to better estimate the prospective risk of cml progression and survival. Clinically, prognostic factors guide the selection of optimal treatment and the development of risk-adjusted treatments in patients awaiting therapy 19 Level II Until recently, Hasford was the most commonly used prognostic scoring system. It relies on these prognostic indicators:. The Hasford score can be calculated for individual patients at the Web site www.
The Sokal and Hasford prognostic scoring systems are both based on clinical and laboratory data obtained at the time of diagnosis; scores obtained after therapy initiation are less reliable. No prognostic scoring system has been specifically designed for patients on imatinib mesylate, although the Sokal and Hasford systems have both been used in major clinical trials of imatinib therapy The Sokal system appears to have gained wider acceptance.
Marin et al. In a sample of patients, these authors showed that failure to achieve at least partial cytogenetic response and the presence of neutrophilia at 3 months were the only independent predictors of progression-free survival pfs.
They constructed a risk score of 0, 1, or 2 points that classifies patients into three prognostic groups. The scoring system was validated in a small sample of 29 patients. Further validation of this prognostic scoring system is needed. Until further investigation validates a more reliable prognostic score for patients who are considering imatinib mesylate, the ccgm - cml recommends the use of the Sokal index for newly diagnosed patients with cml. At patient presentation, investigations should include assessment of prognosis with the Sokal index, a bone marrow bm biopsy, baseline bm G-banding cytogenetics, peripheral blood fluorescence in situ hybridization fish , and quantitative real-time polymerase chain reaction q - rt - pcr determination.
It is important to distinguish the latter test from qualitative or semi-quantitative pcr techniques. The diagnosis of cml is established by any combination of positive results from bm cytogenetic studies, fish , and q - rt - pcr.
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Some of this testing appears redundant, but it serves different purposes. Bone marrow morphology and blast counts remain the standard for assigning cml patients to the cp , ap , or bc stage of the disease. The biopsy, besides characterizing cellularity, helps to determine if fibrosis is present at diagnosis.
Baseline bm cytogenetics are indicated to identify patients who may already show signs of clonal evolution at diagnosis. It also confirms whether the Ph chromosome is present or absent. A baseline fish can determine if chromosome der9 deletions are present or absent. A q - rt - pcr should be performed at baseline. It will help to diagnose the rare cml patient who is Ph-negative by conventional cytogenetic analysis and also fish -negative. More importantly, it also provides baseline data for later comparative studies to monitor treatment response to imatinib mesylate. The q - rt - pcr is the only technique sufficiently sensitive to monitor and ensure that a biologic response to imatinib mesylate is sustained in ccr patients.
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The ccgm - cml recommends the following investigations at diagnosis for all patients with suspected or confirmed cml :. Peripheral blood or bone marrow fish for deletions in chromosome 9. Peripheral blood or bone marrow q - rt - pcr. Before developing their recommendations for treatment of cml , the ccgm - cml reviewed the following evidence-based data and considerations from clinical practice:. Allogeneic sct for cml may be curative, but several difficulties independent of donor availability limit its application as universal therapy for cml.
Many patients fail to qualify for transplantation because of age, health, disease status, and other factors. The risks of transplantation are relatively high and potentially life threatening. Medical therapy is able to prolong the duration of cp cml , reduce the rate of transformation, and improve the annual rate of survival.
If tolerated by most patients, it may produce a greater impact on overall cml survival than does allogeneic sct , even if not curative. Allogeneic sct is the only known cure for cml. Until recently, it was the treatment of choice for patients 55 years of age and younger in generally good health who had a related donor matched for human lymphocyte antigens hla s , or for those 40—45 years of age or younger with an hla -matched unrelated donor.
These criteria, which determine eligibility for treatment, are used at most Canadian transplantation centres. Reduced-intensity allografting, which makes use of the graft-versus-leukemia effect of the allograft, is relatively new and may extend the age limit for transplantation to 79 years or more. Physicians should check with local transplant centres.
Probability of survival after allogeneic stem cell transplants for chronic-phase chronic myelogenous leukemia by donor type and disease duration, — 3. Survival is significantly lower if allogeneic sct is delayed beyond 1 year or if an hla -matched unrelated donor is used. Similarly, survival is considerably lower if cml progresses to ap before transplantation. Patients in bc seldom derive any benefit.
molecular biology of chronic myeloid leukemia | Blood | American Society of Hematology
The choice of allogeneic sct in cp cml involves a tradeoff between exposure to early transplantation-related mortality and long-term disease-free survival. Moreover, the decision needs to be made early, when the patient is well, to minimize the chance that progression will occur and compromise the effectiveness of the procedure.
The risk:benefit ratio varies for individuals, depending on their specific disease-related and allogeneic sct —related risks. The most widely used method to evaluate risk factors and transplantation outcome in cml patients is described by Gratwohl et al. Gratwohl and colleagues developed a clinical scoring system, ranging from 0 to 7, to estimate the 5-year transplantation-related mortality and overall survival for individual patients Table II. Calculation of risk factor score for transplantation patients Grawohl et al. Calculation of prognosis at 5 years by risk factor score Gratwohl et al.
Despite its effectiveness, allogeneic sct has had a relatively modest impact on cml survival.
Chronic myelogenous leukemia
These results, which can be achieved in only a minority of cml patients, are roughly equivalent to overall survival rates predicted for patients on imatinib mesylate therapy, which is feasible in most cml patients. As Goldman et al. Two divergent approaches to managing the newly diagnosed patient with chronic cml have emerged.
One approach is to offer all such patients a 2- to 3-month trial of imatinib mesylate to determine whether they will respond to treatment. Responders would continue on imatinib mesylate indefinitely, while eligible non-responders would proceed to allogeneic sct.