Comprehensive Cancer Centers breaks down leukemia, from its types to its causes, symptoms, diagnosis, and many ways the team may treat the disease for its patients.
Comprehensive Cancer Centers treats leukemia, which is a cancer of the body’s blood-forming tissues, including the bone marrow and the lymphatic system, and it is a complex and multifaceted disease.
Advancements in medical science have transformed our understanding and treatment of leukemia, turning what was once previously considered almost untreatable into a manageable, and in many cases, curable condition. For patients at Comprehensive Cancer, their families and friends, having a clear and comprehensive understanding of leukemia is the first step toward navigating a diagnosis, supporting loved ones, and appreciating the strides made in oncology. Here we delve into critical aspects of leukemia, from its fundamental nature and types to its causes, symptoms, diagnosis, and the ever-evolving landscape of treatment. Comprehensive Cancer Centers offers a variety of advanced leukemia care options for patients across Southern Nevada.
What is Leukemia?
At its core, leukemia is a cancer characterized by the rapid and uncontrolled production of abnormal white blood cells. In a healthy individual, bone marrow, the soft, spongy center of bones, produces hematopoietic stem cells. These stem cells mature and differentiate into the three main types of blood cells: red blood cells (which carry oxygen), platelets (which help blood clot), and white blood cells (which fight infection). In a person with leukemia, this orderly process goes awry. The bone marrow begins to produce an excessive number of abnormal white blood cells, called leukemia cells or blasts.
These malignant cells do not function like healthy white blood cells. They are immature and cannot effectively fight infection. More critically, as they proliferate uncontrollably, they crowd out the bone marrow’s ability to produce healthy red blood cells and platelets. This cellular overcrowding is what leads to the most common symptoms and complications of the disease, such as anemia (from a lack of red blood cells), bleeding and bruising (from a lack of platelets), and a compromised immune system (from a lack of functional white blood cells).
The Four Main Types of Leukemia
Leukemia is not a single disease but a group of related cancers. They are primarily classified in two ways: by the speed of their progression (acute or chronic) and by the type of white blood cell they affect (lymphoid or myeloid).
Acute vs. Chronic:
Acute leukemia is characterized by the rapid proliferation of immature, non-functional blood cells. The disease progresses quickly and requires immediate, aggressive treatment. Chronic leukemia involves the overproduction of more mature, but still abnormal, blood cells. The onset is typically slower, and the disease may go unnoticed for years. Symptoms are often milder initially, but the disease can eventually progress.
Lymphoid vs. Myeloid:
Lymphoid (or lymphocytic) leukemia affects the lymphoid cell line, which produces lymphocytes, a type of white blood cell that forms a crucial part of the immune system. Myeloid (or myelogenous) leukemia affects the myeloid cell line, which produces red blood cells, platelets, and other types of white blood cells like neutrophils and monocytes.
Four Main Types of Leukemia
- Acute Lymphoblastic Leukemia (ALL): This is the most common type of childhood cancer, but it can also affect adults. It is characterized by the rapid growth of immature lymphocytes.
- Chronic Lymphocytic Leukemia (CLL): This is one of the most common types of leukemia in adults in Western countries. It is a slow-growing cancer where the body produces an excessive number of mature but abnormal lymphocytes. Many people live for years with CLL without needing treatment.
- Acute Myeloid Leukemia (AML): This type of leukemia can occur in both children and adults, but is more common in older adults. It is defined by the rapid proliferation of abnormal myeloid cells.
- Chronic Myeloid Leukemia (CML): This type is more common in adults and involves the overproduction of relatively mature myeloid cells. A specific genetic mutation known as the Philadelphia chromosome is present in most cases of CML, a discovery that has revolutionized its treatment.
Leukemia Risk Factors and Causes
While the exact cause of leukemia is unknown in most cases, researchers have identified several factors that can increase a person’s risk of developing the disease. It is crucial to understand that having a risk factor does not mean someone will get leukemia; likewise, many people who are diagnosed have no known risk factors.
- Genetic Predisposition: Certain genetic disorders, such as Down syndrome, Fanconi anemia, and Bloom syndrome, are associated with a higher risk of developing leukemia.
- Previous Cancer Treatment: Individuals who have undergone chemotherapy or radiation therapy for other cancers have an increased risk of developing certain types of leukemia, often referred to as secondary or treatment-related leukemia.
- Radiation Exposure: Exposure to intense radiation, such as from an atomic bomb explosion or a nuclear reactor accident, is a known risk factor.
- Chemical Exposure: Long-term exposure to certain industrial chemicals, most notably benzene (a solvent used in the rubber industry and present in gasoline), has been linked to an increased risk of AML.
- Smoking: Cigarette smoking increases the risk of developing AML.
- Family History: Having a close relative, such as a parent or sibling, with leukemia can slightly increase one’s risk, although this is rare.
Recognizing the Symptoms
The symptoms of leukemia are often vague and non-specific, meaning they can be easily mistaken for more common illnesses like the flu. They arise directly from the shortage of normal blood cells. Common signs and symptoms include:
- Fatigue and Weakness: Persistent tiredness that doesn’t improve with rest is a common symptom, caused by anemia.
- Frequent or Severe Infections: A lack of healthy, infection-fighting white blood cells makes the body vulnerable to bacteria and viruses.
- Easy Bruising or Bleeding: A low platelet count can lead to unexplained bruises, frequent or severe nosebleeds, bleeding gums, or tiny red spots on the skin (petechiae).
- Fever or Chills: These can be signs of infection or a direct result of the leukemia itself.
- Unexplained Weight Loss: A noticeable drop in weight without changes in diet or exercise can be a warning sign.
- Swollen Lymph Nodes, Enlarged Liver or Spleen: Leukemia cells can accumulate in these organs, causing them to swell. This might manifest as a feeling of fullness under the ribs or painless lumps in the neck, underarm, or groin.
- Bone Pain or Tenderness: The overcrowding of leukemia cells in the bone marrow can cause significant discomfort.
Diagnosis and Staging
For Comprehensive Cancer Centers, diagnosing leukemia involves tests to confirm the presence of cancer, determine its specific type, and assess its extent. The process typically begins with a physical exam and a review of the patient’s medical history. If leukemia is suspected, the following tests are crucial:
- Blood Tests: A Complete Blood Count (CBC) measures the number of red blood cells, white blood cells, and platelets. In leukemia, the CBC will typically show abnormal levels, often a very high white blood cell count and low red blood cell and platelet counts. A peripheral blood smear allows a pathologist to look at the blood cells under a microscope to identify abnormal or immature cells.
- Bone Marrow Aspiration and Biopsy: This is the definitive test for leukemia. A doctor uses a needle to remove a small sample of bone marrow, usually from the back of the hip bone. The sample is then analyzed in a lab to identify the presence, type, and percentage of leukemia cells.
- Further Analysis: Advanced tests, such as cytogenetics, flow cytometry, and molecular testing, are performed on the blood or bone marrow samples. These tests look for specific chromosomal abnormalities (like the Philadelphia chromosome in CML) and other genetic markers on the cancer cells. This information is vital for classifying the leukemia subtype and planning the most effective treatment.
Unlike solid tumors, most types of leukemia do not have a traditional staging system (like Stage I-IV) because the cancer is, by nature, widespread throughout the blood and bone marrow from the beginning. Instead, doctors classify it based on its subtype, cytogenetic features, and other prognostic factors.
The Modern Approach to Treatment
Leukemia treatment plans are highly individualized by the care team at Comprehensive Cancer, and depend on numerous factors, including the specific type of leukemia, the patient’s age and overall health, and the genetic characteristics of the cancer cells. The primary goal of treatment is to achieve remission, which means there is no evidence of the disease and bone marrow function returns to normal.
- Chemotherapy: This remains a cornerstone of treatment, especially for acute leukemias. It involves using powerful drugs to kill cancer cells throughout the body. Chemotherapy is typically administered in cycles, with periods of treatment followed by periods of rest and recovery.
- Targeted Therapy: This is one of the most significant breakthroughs in cancer treatment. These drugs are designed to attack specific vulnerabilities in cancer cells, often with fewer side effects than traditional chemotherapy. The development of tyrosine kinase inhibitors (TKIs) for CML, which target the protein produced by the Philadelphia chromosome, has transformed the prognosis for CML patients, turning a fatal disease into a manageable chronic condition for most.
- Immunotherapy: This approach harnesses the power of the patient’s own immune system to fight cancer. Examples include CAR T-cell therapy, where a patient’s T-cells are genetically engineered to recognize and attack leukemia cells, and monoclonal antibodies, which are lab-made proteins that can target specific markers on cancer cells.
- Stem Cell Transplantation (Bone Marrow Transplant): This is an intensive treatment used for some types of leukemia. It involves high-dose chemotherapy and/or radiation to destroy the patient’s diseased bone marrow, which is then replaced with healthy blood-forming stem cells from a donor (allogeneic transplant) or, less commonly, the patient’s own previously collected cells (autologous transplant).
- Radiation Therapy: This uses high-energy rays to kill cancer cells or shrink swollen organs. It is used less frequently as a primary treatment but may be used to treat leukemia that has spread to the brain or before a stem cell transplant.
The journey through leukemia treatment can be long and arduous, often involving significant side effects and emotional challenges. Supportive care, including blood transfusions, antibiotics to prevent infection, and management of treatment side effects, is a critical component of the overall care plan.
Living with and Beyond Leukemia
The prognosis for leukemia has improved dramatically over the past few decades. Survival rates vary widely depending on the type of leukemia and other factors, but research continues to yield new and more effective therapies. For many, particularly children with ALL and adults with CML, long-term remission and cure are now achievable goals.
Living with a leukemia diagnosis is a life-altering experience. Patients and their families face physical, emotional, and financial challenges. Support from healthcare teams, family, friends, and support groups is invaluable. After treatment, survivors may face long-term side effects and the ongoing fear of relapse, making follow-up care and monitoring essential.
Through a deeper understanding of its cellular and genetic basis, medicine has developed a powerful arsenal of treatments that can be tailored to the individual. Knowledge is a powerful tool in the fight against any disease. By understanding what leukemia is, recognizing its symptoms, and being aware of the sophisticated diagnostic and therapeutic options available, we can better support those affected by this cancer and continue to fuel the hope and progress that define the modern era of oncology.
Comprehensive Cancer Centers Can Help
The medical team at Comprehensive Cancer Centers provides a variety of treatment options for patients with leukemia.. To schedule an appointment with the team at Comprehensive, please call 702-952-3350.
The content in this post is not intended to be a substitute for professional medical advice, diagnosis or treatment. Always seek the advice of qualified health providers with questions you may have regarding medical conditions.
