Bone and soft tissue: The bones may be the site to which other cancers spread, but some types originate in the skeleton or the muscles and cartilage (soft tissue).

Brain: Tumors of the brain and spinal cord are the most common types of solid tumors in children.

Leukemias: Cancer of the tissues of the body that make blood cells and involve the bone marrow:

• Acute Lymphoblastic Leukemia (ALL)
• Acute Myelogenous Leukemia (AML)

Lymphomas: Lymphoma is cancer which arises in the lymph system, the body's circulatory network for filtering out impurities:

• Hodgkin's Disease
• Non-Hodgkin's Lymphoma

Neuroblastoma: Found almost exclusively in children, neuroblastoma arises in the adrenal glands, located in the abdominal area near the kidneys, and along the sympathetic nerve chain in the chest and abdomen.

Retinoblastoma: A malignant eye tumor which occurs in young children and may show a hereditary pattern.

Wilms' Tumor: This rapidly developing tumor of the kidney most often appears in children, usually between the ages of two and four, and is very different from adult kidney cancers.