Leukemia

Leukemia known as blood cancer is a disease in the classification of cancer (neoplasm) in the blood or bone marrow characterized by the abnormal multiplication or malignant transformation of blood-forming cells in bone marrow and lymphoid tissue, commonly occurs in leukocytes (white blood cells).

Normal cells in the bone marrow are replaced by abnormal cells. These abnormal cells out of the marrow and can be found in the peripheral blood. Leukemic cells affecting hematopoietic or blood cell formation process and the immunity of the patient.

Radiotherapy

Radiotherapy is the medical use of ionizing radiation, generally as part of cancer treatment to control or kill malignant cells. Radiation therapy may be curative in a number of types of cancer if they are localized to one area of the body. It may also be used as part of curative therapy, to prevent tumor recurrence after surgery to remove a primary malignant tumor (for example, early stages of breast cancer). Radiation therapy is synergistic with chemotheraphy, and has been used before, during, and after chemotherapy in susceptible cancers cell.

Radiation therapy is commonly applied to the cancerous tumor because of its ability to control cell growth. Ionizing radiation works by damaging the DNA of exposed tissue leading to cellular death. To spare normal tissues, shaped radiation beams are aimed from several angles of exposure to intersect at the tumor, providing a much larger absorbed dose there than in the surrounding, healthy tissue.