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a) Acute lymphoblastic leukemia (ALL): this is a cancer of immature lymphocyte

cells, known as lymphoblasts. This disease is the most common type of leukemia in
young children, usually between the ages of 1 and 7 and is quite rare in adults.

b) Acute myeloid leukemia (AML): this is a cancer of the immature myeloid cells. This

disease occurs mainly in adults, but can also affect children.

c) Chronic lymphocytic leukemia (CLL): this is a cancer of the lymphocyte cells. This

disease is the most common type of leukemia affecting adults, and is very rare in
children.

d) Chronic myeloid leukemia (CML): this is a cancer of the neutrophils cells. This type
of leukemia is rare in children and commonly affects male adults more than females.

3.3 Lymphomas

Lymphoma is a cancer of certain types of white blood cells (WBCs) called lymphocytes.

These cells circulate throughout the body in the blood stream and in the lymphatic

system, which is part of the body's immune system. There are several different types of
lymphocytes, the major types being the B-lymphocyte and the T-lymphocyte.

Lymphoma begins with the production of one or more abnormal cells in one or

more of the lymph nodes, areas where lymphocytes congregate. These cells
reproduce uncontrollably; begin to outnumber normal cells in the node lead to

the enlargement of the lymph node, and eventually travel to one or more other

lymph nodes. They may also spread to and from other lymph-system-related
organs including the spleen, bone marrow, tonsils, adenoids, and thymus.

Types of Lymphoma
There are two primary types of lymphoma: Hodgkin lymphoma (HL, also called

Hodgkin's disease), which is characterized by the presence of large distinctive cells

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