Lymphoid leukemia

What is lymphoid leukemia? 

Lymphoid leukemia is a type of cancer that affects lymphocytes, essential cells of the immune system. It is characterized by the excessive production of abnormal lymphocytes. Lymphocytes, a specific type of white blood cell, are crucial to the immune system, as they help fight infections and diseases. These cancerous cells do not function properly and can crowd out healthy blood cells, hindering the body’s ability to fight infections, control bleeding, and can lead to severe anemia. Lymphocyte leukemia can be of two very different types: acute lymphoblastic leukemia (ALL) and chronic lymphocytic leukemia (CLL), depending on how quickly the disease progresses. Understanding this disease is crucial for proper diagnosis and treatment. 

It is important to remember that these symptoms can be caused by other medical conditions, so it is essential to consult a doctor to obtain an accurate diagnosis. The severity and presentation of symptoms can vary from person to person, highlighting the importance of a thorough medical evaluation. 

Classification of lymphoid leukemia 

Lymphoid leukemia is classified into two major types, each with distinct characteristics and progression patterns. Understanding the classification is essential to determine the most appropriate treatment approach. The two main types are described below: 

• Acute Lymphoblastic Leukemia (ALL): it is a cancer of the bone marrow and therefore of the blood, characterized by the uncontrolled growth of lymphoblasts (a very immature type of white blood cell). It is the most common type of cancer in children, but it can also occur in adults. ALL develops rapidly and requires immediate treatment. Several subtypes can be distinguished, including: 

• B-cell acute lymphoblastic leukemia (B-ALL): it is the most common subtype, accounting for approximately 75% of cases. It originates in B lymphoblasts, which are precursors of B lymphocytes. 

• T-cell acute lymphoblastic leukemia (T-ALL): It originates in T lymphoblasts, which are precursors of T lymphocytes. It is less common than B-cell ALL. 

• Mature B-cell ALL (Burkitt): it is the most aggressive and very fast-growing subtype. 

• Mixed B/T-cell acute lymphoblastic leukemia (ALL): it exhibits characteristics of both B cells and T cells.  

• Chronic Lymphocytic Leukemia (CLL): it is a very slow-progressing cancer of the bone marrow and blood that affects mature lymphocytes. It is more common in older adults. CLL is classified according to the degree of maturation of the cancer cells and the presence of certain genetic alterations. CLL can be of several subtypes, including: 

• B-cell chronic lymphocytic leukemia (CLL): it is the most common subtype, accounting for approximately 95% of cases. 

• B-cell prolymphocytic leukemia (B-PLL): it is a rare and aggressive subtype of CLL that usually develops as a progression of the previous one. 

• T-cell large granular lymphocytic leukemia (T-LGL leukemia): it is a common subtype that affects large granular T lymphocytes and does not usually require treatment. 

Causes of lymphocytic or lymphoblastic leukemia 

Despite advances in research, the exact causes of lymphocytic leukemia  

are not fully known. However, it is believed that a combination of genetic and environmental factors may contribute to the development of the disease.  

In ALL, lymphoid stem cells in the bone marrow develop errors in their chromosomes and therefore in their DNA. These genetic errors cause alterations in both the growth and the function of blood cells. In CLL, research suggests that the following causes may be related to its development: 

• Genetic mutations: losses, gains, or rearrangements of certain genes (TP53, del(17p), or IGHV) play a major role in the development of CLL. 

• Hereditary factors: there is some familial predisposition to CLL, but not a direct genetic inheritance.  

• Exposure to certain chemicals: exposure to certain toxins such as herbicides, insecticides, or varnishes has been linked to an increased risk of CLL. 

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Complications of lymphocytic or lymphoblastic leukemia 

Lymphoid leukemia can cause various complications that affect patients’ health and quality of life. These complications can arise as a result of the disease itself or the treatments used to combat it. It is essential to be aware of these possible complications and to seek appropriate medical care. Some of the most common complications include: 

• Infections: leukemia and cancer treatments can weaken the immune system, increasing the risk of infections. 

• Anemia: leukemia can cause a decrease in the production of red blood cells, which leads to anemia. 

• Bleeding: leukemia can affect the blood’s ability to clot, increasing the risk of bleeding. 

• Infiltration of other organs: leukemia can spread to other organs, such as the brain, lungs, or lymph nodes. 

If you suspect you have lymphocytic leukemia, consult a specialist to obtain an accurate diagnosis and an appropriate treatment plan tailored to your needs. 

Diagnosis of lymphocytic or lymphoblastic leukemia 

The diagnosis of lymphocytic leukemia is a comprehensive process that combines clinical evaluation with specialized laboratory tests to confirm the presence of the disease, determine its type and subtype, and assess its extent. An accurate diagnosis is essential to guide treatment decisions and improve outcomes for patients. The following are some of the common diagnostic methods used for lymphocytic leukemia, differentiating between ALL and CLL: 

Acute Lymphoblastic Leukemia (ALL): 

• Physical examination: the doctor will look for signs of leukemia, such as swelling of the lymph nodes, liver, or spleen. These signs can provide important clues about the presence and extent of the disease. 

• Blood tests: blood tests will be performed to evaluate the levels of white blood cells, red blood cells, and platelets. Tests can also be performed to detect the presence of leukemic cells (blasts) in the blood. 

• Bone marrow aspiration and biopsy: a sample of bone marrow is taken for microscopic examination to detect the presence of cancer cells. In ALL, the bone marrow is usually infiltrated by a high percentage of blasts. 

• Flow cytometry: this test is used to identify the types of cells present in the blood or bone marrow and to detect the presence of leukemic cells. Flow cytometry allows doctors to identify specific markers on the surface of cells, which helps determine the lineage (B or T cells) and the degree of maturation of cancer cells. 

• Genetic testing: genetic testing can be performed to identify chromosomal or genetic alterations associated with leukemia. These tests may include karyotyping, fluorescence in situ hybridization (FISH), and next-generation sequencing (NGS). Identifying specific genetic alterations can help classify leukemia and predict its response to treatment. 

Chronic Lymphocytic Leukemia (CLL): 

• Physical examination: the doctor will look for signs of leukemia, such as swelling of the lymph nodes, liver, or spleen. These signs may be less evident in the early stages of CLL. 

• Blood tests: blood tests will be performed to evaluate the levels of white blood cells, red blood cells, and platelets. In CLL, the lymphocyte count is usually elevated. 

• Flow cytometry: this test is used to confirm the diagnosis of CLL and differentiate it from other conditions that can cause an increase in the lymphocyte count. Flow cytometry allows doctors to identify specific markers on the surface of CLL cells, such as CD5 and CD23. 

• Bone marrow aspiration and biopsy: this procedure is not always necessary for the diagnosis of CLL, but it can be performed to assess the extent of the disease in the bone marrow. 

• Genetic testing: genetic testing can be performed to identify chromosomal or genetic alterations associated with CLL, such as deletion of chromosome 13q, deletion of chromosome 11q, trisomy 12, and mutation of the TP53 gene or IGHV. These alterations can provide important information about the prognosis of the disease. 

HM Hospitales provides advanced diagnostic services for leukemia, including blood tests, bone marrow aspiration and biopsy, flow cytometry, and genetic testing.  

Treatments for lymphocytic or lymphoblastic leukemia 

Treatment for lymphocytic leukemia is tailored to the individual needs of each patient and depends on several factors, including the type of leukemia, the stage of the disease, the patient’s age, and overall health status. The main goal of treatment is to destroy cancer cells and achieve long-term remission. Treatment options are very different between ALL and CLL: 

Acute Lymphoblastic Leukemia (ALL): 

• Chemotherapy: it uses medications to destroy cancer cells. Chemotherapy is the cornerstone of treatment for ALL and is generally administered in phases, including induction, consolidation, and maintenance. 

• Targeted therapy: medications are used that target cancer cells without harming healthy cells. These medications target specific proteins or pathways that are essential for the growth and survival of cancer cells. Some examples of targeted therapies used in ALL include tyrosine kinase inhibitors (TKIs). 

• Immunotherapy: medications are used that stimulate the immune system to fight cancer. These medications may include monoclonal antibodies, immune checkpoint inhibitors, and chimeric antigen receptor (CAR) T-cell therapy. 

• Stem cell transplantation: damaged stem cells are replaced by healthy stem cells. This procedure can be used to treat ALL in selected patients. Stem cell transplantation can be autologous (using the patient’s own stem cells) or allogeneic (using stem cells from a donor). 

Chronic Lymphocytic Leukemia (CLL): 

• Observation: in the early stages of CLL, when the disease progresses slowly and does not cause symptoms, immediate treatment may not be required. Instead, the doctor may recommend careful observation to monitor the disease and begin treatment only if it progresses or causes symptoms. 

• Chemotherapy: it uses medications to destroy cancer cells. In CLL, chemotherapy can be used in combination with other treatments, such as immunotherapy, but it is currently falling out of use. 

• Targeted therapy: medications are used that target cancer cells without harming healthy cells. These medications target specific proteins or pathways that are essential for the growth and survival of cancer cells. Some examples of targeted therapies used in CLL include BCL-2 inhibitors and BTK inhibitors. 

• Immunotherapy: medications are used that stimulate the immune system to fight cancer. These medications may include monoclonal antibodies. 

• Stem cell transplantation: damaged stem cells are replaced by healthy stem cells. This procedure can be used to treat CLL in highly selected patients, especially if the disease is aggressive or does not respond to other treatments. 

HM Hospitales provides a wide range of treatment options for leukemia, including chemotherapy, targeted therapy, immunotherapy, stem cell transplantation, and radiotherapy. Our multidisciplinary team of specialists can develop a personalized treatment plan tailored to individual needs. 

Remember that this article is for informational purposes only and does not replace professional medical advice. If you suspect you have lymphocytic leukemia, consult a specialist to obtain an accurate diagnosis and an appropriate treatment plan tailored to your needs.