Childhood cancer is rare. Childhood cancer arises from the primitive cells, thus the types of cancer found in children is significantly different than cancer in adults. And, because children are still growing they often have special physical and emotional needs. Childhood cancers tend to be more aggressive than adult cancers. Children are often treated at specialized Centers by team specialists who know the difference between childhood and adult cancers. The team specialists include pediatric oncologists, surgeons, radiation oncologists, pediatric oncology nurses and nurse practitioners. Childhood cancer typically refers to the type of cancer that affects the age groups from infancy to twenty one years old. However, it is possible for young adults to also develop a 'childhood cancer'.