Neuroblastoma is a type of cancer that originates from the immature nerve cells. It can affect any part of the body that contains such type of nerve cells .
Neuroblastoma mostly strikes infants and children younger than 10 years. Older children are rarely affected by this disease. Neuroblastoma is characterized by development of small, round, blue colored tumor cells in the nerve tissues. It is the 4th most common type of cancer affecting children. It commonly originates in areas such as adrenal glands. However, in many instances it is also found in abdomen, neck, and chest and in the neighboring areas of the spine .
The exact factors that trigger the development of these malignant tumor cells in the nerve cells of children are not clear. Heredity or environmental factors do not seem to have any role in the development of neuroblastoma .
Typically, the cancer begins with a genetic mutation that signals the cells to grow in an uncontrollable fashion. The resultant reaction of cell overgrowth is a malignant tumor. Neuroblastoma begins in the neuroblasts which are essentially immature nerve cells that are naturally made during the fetal growth. In many instances, these neuroblasts mature at birth, some which fail to mature either disappear or mature eventually as the child grows. In some cases, however, tumor develops in the neuroblasts causing neuroblastoma.
Neuroblastoma affects majorly the pediatric population, exclusively those aged 10 years and below. Boys are slightly at an increased risk of contracting this disease condition than girls. It has been estimated that each year about 600 cases of neuroblastoma are diagnosed in the US. Such a type of cancer is more common in whites .
Statistics have also shown that about 36% cases of neuroblastoma are diagnosed in infants, 79% cases are diagnosed in children less than 4 years and 97% cases are diagnosed in children aged 10 years.
Neuroblastoma is a type of cancer that affects the immature cells of the sympathetic nervous system. This type of nervous system is a vital part of autonomic nervous system which essentially governs the functioning of majority of the body organs. In majority of the cases, neuroblastomas begin in the adrenal glands, others in the sympathetic nerves present in the abdomen.
Several type of karyotopic abnormalities occur in neuroblastoma, but deletion of short arm of chromosome 1 is a major characteristic finding in the majority (70–80%) of cases. The sequence of events that cause such a type of phenomenon to occur is poorly understood .
The prognosis of neuroblastomas varies with the nature of tumor cells. In some cases, the tumor disappears without any treatment; whereas in some, the tumor is benign in nature known as ganglioneuroma. Such type of tumors can be surgically removed. However, in cases, when the tumor is malignant in nature, the cancer quickly spreads which makes the treatment process more difficult .
Fever and feeling of malaise are the primary signs of neuroblastoma. Children also complain of poor appetite and eventually undergo weight loss. In addition to these, there are several other symptoms of neuroblastoma that vary with the site of the cancer.
When the cancer has developed in the sympathetic nerves of abdomen, individuals experience abdominal pain, swelling in legs, diarrhea and presence of a mass which is not tender when touched. Individuals in whom the cancer has affected the chest suffer from wheezing, pain in the chest, drooping eye lids and difference in the pupil size.
Neuroblastoma is diagnosed by the following methods:
Treatment of neuroblastoma majorly depends on the location of the tumor and stage of the disease. In many cases, surgery is the treatment of choice and is often successful. This may be combined with chemotherapy and radiation therapy to arrest the growth of the cancer cells  .
Immunotherapy is also given to children with high risk tumors. In this method, the children are given drugs to stimulate their immune system. The efficacy of stem cell transplantation is still being studied, for children with high risk tumors .
So far there are no established guidelines for preventing development of neuroblastoma. However, there are small pieces of evidence suggesting that intake of vitamins and folic acid supplements during pregnancy can prevent the onset of such type of cancer.
Neuroblastoma is a type of cancer that originates in the immature nerve cells. A cancer of this type mostly strikes the infant and children population. It is considered to be the 4th most common type of cancer after lymphoma, leukemia and tumors of central nervous system.
The exact cause behind development of malignant tumors in the nerve cells is yet not known. Genetic mutations in the immature nerve cells cause uncontrolled growth of cells that finally develop into malignant tumor cells.
Symptoms of neuroblastoma consist of fever, malaise, wheezing, development of non–tender mass beneath the skin, diarrhea, chest pain, swelling in legs, bone pain, unexplained weight loss, changes in appetite and development of protopsis.
Diagnosis of neuroblastoma begins with a preliminary physical examination followed by blood and urine tests to detect levels of chemicals and hormones. In addition, imaging studies are also carried out to locate the site of the tumor cells. Biopsy of the tumor cells are also done to analyze its nature.
In many cases, surgery is often successful in removing the malignant cells. However, other treatment methods such as chemotherapy, radiation therapy and immunotherapy are also employed.