To put it in simple terms, leukaemia is the cancer of the white blood cells. As we know, our blood has three types of cells- red blood cells, white blood cells and platelets. In leukaemia, the white blood cells multiply uncontrollably causing various problems in the body.
There are two main types of acute leukaemia:
Acute myeloid leukaemia
Acute lymphoid leukaemia
Leukaemia in which the myeloid cells are involved. Now, what are myeloid cells? These are cells that are present in the bone marrow or any tissues resembling bone marrow. these include all the blood cells except lymphocytes.
The word “acute” refers to the conditions which progress rapidly to an advanced stage. It becomes potentially fatal from a seemingly normal or mild condition in a very short duration.
In Acute Myeloid Leukaemia, the myeloid cells multiply at a very rapid pace.
What are the risk factors that are associated with acute myeloid Leukaemia?
Preleukaemic disorders: There are a few disorders which make an individual vulnerable to leukaemia. These are myelodysplastic syndromes and myeloproliferative disease. Some blood disorders also act as a preleukaemic disorder, for example, polycythaemia vera, idiopathic myelofibrosis and thrombocythemia.
Chemical agents: it is seen that alkylating agents which are used to treat other cancers through chemotherapy may end up causing Acute Myeloid Leukaemia.
Exposure to chemicals like benzene and formaldehyde through professional hazards can also cause AML. Benzene is a chemical substance that is commonly used as a solvent in rubber industries, oil refineries, shoe manufacturing industries and is also found in motor vehicle exhaust, glues, cleaning products, detergents, art supplies and paints.
Radiation exposure: Exposure to radiation due to atomic bombs, radiation plants, or even radiology labs in high doses can cause mutation of cells leading to Acute Myeloid Leukaemia. It was seen that Japanese atomic bomb accident- Hiroshima and Nagasaki caused its survivors to develop AML, most often 6-8 years after survival.
If a foetus is exposed to radiations in its initial stages of development, it may develop leukaemia, although the extent of the risk factor is not clearly understood.
Smoking: one of the leading causes of all types of cancers and leukaemia. We know that smoking can cause cancers associated with the lungs. But it can also cause dysplastic changes in the blood cells. The toxins from tobacco get absorbed through the lungs and enter the bloodstream, which might result in the development of leukaemia. It is the only proven lifestyle habit that causes Acute Myeloid Leukaemia.
Genetic disorders: genetic disorders like Fanconi’s anaemia, Bloom syndrome, ataxia-telangiectasia, severe congenital neutropenia, neurofibromatosis type 1 and Li-Fraumeni syndrome may be predisposing factors for AML. Down’s syndrome and trisomy 8 also have a history of Acute Myeloid Leukaemia.
Family history: if anyone in the family line has a history of AML, the person also has an increased risk, especially if it is his/her own twin who got diagnosed with leukaemia before the age of one.
Age and sex: although Acute Myeloid Leukaemia can occur in anyone, it is seen to have increased prevalence in older males.
To understand what happens to the DNA, we must know what the normal state of the cells is. When the myeloid tissues produce blood cells, it starts out in a stage called “blast” stage. This is an immature cell stage. The cells then are programmed to mature into the adult stage where they perform their functions.
Now, our cells know when to divide and when to stop with the help of certain components in the chromosomes (parts of the DNA that decides important functions). The parts that help in initiating division are called oncogenes. The parts which help in killing the cells are called tumour suppressor genes.
When there are some defects in the DNA, due to the factors mentioned above, these two parts may get expressed more or less than required. For example, FLT3, c-KIT, and RAS are seen in patients with Acute Myeloid Leukaemia which are oncogenes. They are usually over-expressed and lead to uncontrolled growth of cells.
There are various ways in which defects may creep up into the DNA. Usually, the body destroys these cells, but sometimes, they make their way into the cell cycle and cause havoc in the systems.
Translocation: When a part of the chromosome breaks off and re-attaches to another part, where it does not belong.
Deletion: When a part of the chromosome automatically gets removed.
Addition: When a part of the chromosome gets duplicated multiple times.
Inversions: When a part of the chromosome gets detached and re-attached in an inverse way.
General symptoms of Acute Myeloid Leukaemia: Certain non-specific symptoms which are seen in AML but can also be due to a result of other disorders. These are:
Fatigue: as we know, red blood cells help in transporting oxygen through a substance known as haemoglobin. If the number of red blood cells is reduced, then obviously the oxygen carried to parts of the body will be less and the subsequent energy levels will also be less. As a result, the person feels weak and tired.
Pallor: this term implies a pale discolouration. It is due to the reduced red cells which leads to a characteristic paleness, especially visible on the mucous membranes and nail beds.
Dizziness: less oxygen is transported to vital organs like the brain tissues. This leads to dizziness and often, a confused state of mind.
Shortness of breath: as the amount of energy required by the body is more than the energy received by it, the person faces shortness of breath, as an attempt of the body to increase the amount of oxygen in the blood.
Cold body temperature: patient frequently complains of feeling cold due to the reduced oxygen content in the blood and reduced energy levels.
In case of patients with Acute Myeloid Leukaemia, the white blood cell count is abnormally high, but these cells are rendered useless as they are not capable of protecting the person from infections. The patient might be vulnerable to infections which may become more serious than it actually is or may repeatedly be attached to infections.
DUE TO LOW PLATELET CELLS (thrombocytopenia)
Increased bleeding of small wounds
Bleeding of gums
Platelets are needed for the clotting of blood. When the count reduces in case of leukaemia patients, it leads to frequent bleeding which may lead to prolonged bruises and bleeding spots.
Leukaemia leads to increased counts of leukocytes or white blood cell. These are of the abnormal immature type which does not perform the functions of healthy white blood cells but instead, take up space in the blood vessels, making the blood thicker. The amount of oxygen is also reduced. This whole condition is termed as leukostasis. This leads to various other problems like:
Bone and joint pain due to a build-up of cells
Abdominal swelling due to tender spleen and liver from an accumulation of WBC.
Rashes on the skin (may spread to the skin as chloroma, granulocytic sarcoma, myeloid sarcoma)
Enlargement and swelling of gums
Enlargement of lymph nodes (grape sized nodes at specific locations which may be tender)
Advanced stages can cause seizures, facial numbness, problems with balance.
Many tests are performed before the doctor can confirm AML.
Complete blood picture and blood smear: A few drops of blood is examined under a slide to get a rough count of the number of each type of cells, the shape of the cells, the sizes and other abnormalities that can be detected.
Blood chemistry: This test measures the values of certain chemicals in the blood and it is checked if they fall within the estimated normal values.
Coagulation tests: These tests see the rate of blood clotting and bleeding and is useful in estimating the deficiency of platelets.
Other advanced tests: Cytometry, Immunohistochemistry, Flow cytometry, Cytogenetics, Fluorescent in situ Hybridisation, Polymerase Chain Reaction.
CT scans: It is only done if the doctor suspects enlargement of spleen and lymph nodes. It is done to estimate the spread of cancer.
ULTRASOUNDS: These tests are again done to look at growing masses in the other organs.
There are two main stages in the treatment of AML: they are induction and consolidation.
The first stage focuses on reducing the levels of leukemic cells to an undetectable level. Usually, Chemotherapy is used.
The success of this stage is not that the disease is cured but that it cannot be detected in the available diagnostic methods.
the final stage is an intensive chemotherapy focussed on the remnant leukemic cells. This is to prevent remission. Alternatively, the patient can undergo stem cell therapy also known as Bone Marrow Transplant in severe cases.
Stem cell therapy is also used in patients who have relapsed after primary leukaemia treatment.
The key difference is the fact that one is a defect from the myeloid cells and the other is a defect from lymphoblastic cells.
AML affects by producing defective blood cells except for lymphocytes. Acute Lymphoblastic Leukaemia affects by producing excessive amounts of lymphoblasts.
While AML incidence increases with age, ALL is seen in early childhood and older individuals.
The symptoms and treatments tend to be the same in both types of leukaemia.
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