For many people, the word leukemia sounds distant, technical, and even mysterious. Yet leukemia is one of the most common blood cancers in the world, affecting hundreds of thousands of people every year, including children. Despite this, awareness remains low, especially outside medical circles.
Leukemia is a cancer of the blood and bone marrow, the soft tissue inside bones where blood cells are made. According to the World Health Organization (WHO), leukemia occurs when the body produces abnormal white blood cells that multiply uncontrollably and prevent healthy blood cells from doing their job.
“Leukemia disrupts the normal production of blood cells, which are essential for oxygen transport, immunity, and clotting,” the WHO explains in its cancer overview.
How Leukemia Develops
Under normal conditions, the bone marrow produces a balanced mix of red blood cells, white blood cells, and platelets. In leukemia, this balance breaks down. The bone marrow starts producing immature or abnormal white blood cells that do not function properly. These cancerous cells crowd out healthy cells, weakening the body.
The American Cancer Society (ACS) notes that the exact cause of leukemia is often unknown, but several risk factors have been identified. These include genetic conditions, exposure to high levels of radiation, certain chemicals such as benzene, previous cancer treatments, and, in some cases, viral infections.
Importantly, leukemia is not contagious, and it is not caused by stress, diet, or emotions.
Symptoms and Complications
Leukemia can develop quickly or slowly, depending on the type. Common symptoms include persistent fatigue, frequent infections, fever, pale skin, unexplained bruising or bleeding, bone pain, and swollen lymph nodes.
“When healthy blood cells are replaced by leukemia cells, patients become more vulnerable to infections and bleeding,” explains Dr. Hagop Kantarjian, a leukemia specialist at MD Anderson Cancer Center, in a statement cited by the American Cancer Society.
If not treated early, leukemia can become life threatening. Severe infections, organ damage, and internal bleeding are among the most serious complications.
Treatment Options: From Chemotherapy to Transplant
Treatment depends on the type of leukemia, the patient’s age, and overall health. Chemotherapy remains the most common treatment, often combined with targeted drugs or immunotherapy. However, for many patients especially those with aggressive or relapsed leukemia, a bone marrow transplant offers the best chance of long-term survival.
How a Bone Marrow Transplant Works
A bone marrow transplant, also known as hematopoietic stem cell transplantation, replaces diseased bone marrow with healthy stem cells.
According to the National Institutes of Health (NIH), the process involves three main steps:
- High-dose chemotherapy or radiation to destroy the cancerous bone marrow
- Infusion of healthy stem cells, usually from a matched donor
- Recovery, during which the new stem cells settle in the bone marrow and begin producing healthy blood cells
“These transplanted stem cells can rebuild a patient’s blood and immune system,” the NIH explains.
There are two main types of transplants:
- Allogeneic transplant, using cells from a donor
- Autologous transplant, using the patient’s own previously collected cells
While potentially lifesaving, the procedure is complex and carries risks, including severe infections and a condition called graft-versus-host disease, where donor cells attack the patient’s body.
Leukemia by the Numbers: Africa and the World
Globally, leukemia accounts for nearly 500,000 new cases and over 300,000 deaths each year, according to data from GLOBOCAN, the International Agency for Research on Cancer’s global cancer database.
High-income regions such as North America and Europe report the highest incidence rates, largely due to better diagnosis and reporting. In contrast, Sub-Saharan Africa reports lower official rates, but experts warn this does not mean the disease is rare.
“Cancer statistics in Africa often underestimate the true burden due to limited diagnostic capacity and incomplete cancer registries,” the WHO has stated in multiple regional health reports.
In Africa, access to leukemia treatment remains uneven. Chemotherapy is available in many countries, but bone marrow transplant centers are extremely limited. According to the African Blood and Marrow Transplantation Group, only a small number of countries including South Africa, Egypt, Morocco, Tunisia, and a few others currently perform transplants regularly.
Cost, lack of specialized hospitals, shortage of trained specialists, and limited donor registries remain major barriers.
Why Awareness Matters
Health experts agree that early diagnosis dramatically improves survival. In countries with advanced healthcare systems, survival rates for some childhood leukemias exceed 80 percent, according to the American Cancer Society. In many low-income settings, survival remains far lower.
“Leukemia is no longer a death sentence in many parts of the world,” the ACS notes. “But access to timely diagnosis and modern treatment makes all the difference.”
As global health organizations push for more equitable cancer care, leukemia stands as a reminder that awareness, early detection, and access to advanced treatment can save lives regardless of geography.
