Leukemia is a type of cancer that starts in the blood-forming tissue of the bone marrow. It is the most common type of cancer in children and the second most common type of cancer in adults. There are many different types of leukemia, each with its own unique characteristics. Some of the most common types include acute lymphoblastic leukemia (ALL), acute myeloid leukemia (AML), chronic lymphocytic leukemia (CLL), and chronic myeloid leukemia (CML).

The symptoms of leukemia can vary depending on the type of leukemia, but some common symptoms include fatigue, weakness, weight loss, fever, night sweats, and bleeding. Leukemia is diagnosed with a blood test and a bone marrow biopsy. Treatment for leukemia typically involves chemotherapy, radiation therapy, and stem cell transplant. The prognosis for leukemia depends on the type of leukemia, the stage of the disease, and the patient's age and overall health.

There have been many advances in the treatment of leukemia in recent years, and the outlook for patients with leukemia is improving. New treatments, such as targeted therapy and immunotherapy, are showing promise in improving the survival rates of patients with leukemia. Researchers are also working on developing new ways to prevent leukemia.