Leukemia: Types, Symptoms, Diagnosis and Treatment Options

What Is Leukemia?

Leukemia is a cancer of the blood-forming tissues, including the bone marrow.

It develops when abnormal blood cells grow uncontrollably and interfere with the production of healthy blood cells. Unlike many other cancers, leukemia usually does not form a solid tumor.

Instead, abnormal cells can accumulate in the bone marrow and bloodstream, affecting the body's ability to fight infection, carry oxygen and control bleeding.

What Are the Main Types of Leukemia?

Leukemia is classified according to how quickly it develops and which type of blood cell is affected.

The four major types are:

Acute Myeloid Leukemia (AML)

AML develops rapidly and affects myeloid cells. It occurs mainly in adults but can also affect children.

Acute Lymphoblastic Leukemia (ALL)

ALL develops quickly and affects lymphoid cells. It is the most common type of leukemia in children, although adults can also develop it.

Chronic Lymphocytic Leukemia (CLL)

CLL usually progresses more slowly and affects lymphocytes. It is most commonly diagnosed in older adults.

Chronic Myeloid Leukemia (CML)

CML affects myeloid cells and often develops more slowly than acute leukemia. Modern targeted therapies have significantly changed the treatment of many patients with CML.

What Are the Symptoms of Leukemia?

Symptoms vary depending on the type of leukemia and how advanced it is.

Possible symptoms include:

• Persistent tiredness or weakness
• Frequent infections
• Fever
• Unexplained weight loss
• Easy bruising or bleeding
• Frequent nosebleeds
• Small red spots under the skin
• Pale skin
• Bone or joint pain
• Swollen lymph nodes
• Night sweats
• Shortness of breath

These symptoms can also occur with many conditions that are not cancer. Persistent or unexplained symptoms should therefore be assessed by a doctor.

How Is Leukemia Diagnosed?

Diagnosis usually begins with a medical history, physical examination and blood tests.

A complete blood count can show abnormal numbers of white blood cells, red blood cells or platelets.

If leukemia is suspected, a bone marrow aspiration or biopsy may be performed to examine the blood-forming cells in more detail.

Additional laboratory tests can identify genetic, chromosomal or molecular changes in leukemia cells.

These results are important because they help doctors determine the exact type of leukemia, estimate how the disease may behave and choose the most appropriate treatment.

How Is Leukemia Treated?

There is no single treatment plan for all leukemia patients.

Treatment depends on factors such as:

• Type of leukemia
• Genetic characteristics of the cancer cells
• Age of the patient
• General health
• Whether the disease is newly diagnosed or has returned
• Previous treatments

Chemotherapy

Chemotherapy is an important treatment for many acute leukemias.

It uses medicines that destroy rapidly dividing cancer cells or prevent them from multiplying.

Treatment may be divided into several phases depending on the type of leukemia.

Targeted Therapy

Targeted medicines attack specific changes that help leukemia cells grow.

For example, certain forms of chronic myeloid leukemia can be treated with drugs that target abnormal proteins produced by the leukemia cells.

Molecular testing is therefore increasingly important when selecting treatment.

Immunotherapy

Some forms of leukemia can be treated using therapies that help the immune system recognize and attack cancer cells.

These may include monoclonal antibodies and other specialized immune-based treatments.

In selected patients, advanced treatments such as CAR T-cell therapy may also be considered.

When Is a Stem Cell Transplant Considered?

A hematopoietic stem cell transplant, often called a bone marrow transplant, may be recommended for certain patients.

It can allow doctors to use intensive treatment to destroy diseased blood-forming cells before replacing them with healthy stem cells.

Stem cell transplantation is not necessary for every leukemia patient.

The decision depends on the leukemia type, risk level, response to previous treatment, age, overall health and availability of a suitable donor when donor cells are required.

Does Every Patient Need Treatment Immediately?

Not always.

Acute leukemias usually require treatment quickly because they can progress rapidly.

Some chronic leukemias behave differently. For example, selected patients with early chronic lymphocytic leukemia may be monitored closely without immediate treatment if the disease is not causing significant problems.

This approach is sometimes called active surveillance or watchful waiting.

Follow-Up After Leukemia Treatment

Patients need regular follow-up after treatment.

Doctors may perform blood tests, bone marrow tests or molecular tests to determine whether leukemia cells remain and to monitor for recurrence.

Follow-up is also important for managing treatment side effects, infections and long-term complications.

Living With Leukemia

A diagnosis of leukemia does not describe one single disease.

Different leukemia types can behave very differently and require completely different treatments.

Accurate classification and molecular testing are therefore essential before treatment begins.

Patients diagnosed with leukemia should be evaluated by a hematology team experienced in blood cancers. In cases where intensive chemotherapy, stem cell transplantation or advanced therapies may be required, treatment at a specialized hematology and transplant center can provide access to the multidisciplinary care needed throughout the treatment process.