Unfortunately, they. All are. While the risks differ for separate malignancies, they all can leed to bad outcomes either from the cancer or treatment for it. The most common pediatric cancer, all, is also one with one of the best prognoses. However, because it is far more common than many other cancers, many deaths still occur because of it. Cancer kills more children than any other disease. This has to change!
Many. Children can get a variety of cancers. Many are deadly, like acute lymphocytic leukemia, burkitt's lymphoma/leukenia, and especially many of the brain tumors, like pilocytic astrocytoma which is benign, but can be dangerous by being in an unresectable place.
Most. Most cancers are potentially fatal if not treated successfully. Do you have questions regarding specific cancers and treatment?