Causes of Cancer There is no one single cause for cancer. Scientists believe that it is the interaction of many factors--genetic, environmental, or constitutional characteristics of the individual. Diagnosing Cancer Many tests are necessary to determine whether a child has cancer, or if another condition is mimicking the symptoms of cancer. Questions to Ask Your Child's Doctor Parents are entitled to a clear explanation about anything related to their child's condition. Here are some important questions you may consider asking your child's doctor. Coping with a Diagnosis of Cancer in Children A cancer diagnosis is shocking and overwhelming. But prognosis of childhood cancer continues to improve, and the chance of being cured continues to increase. Cancer Overview Cancer cells don't function properly, and they can spread to many areas of the body. Tumors are clusters of cells that are capable of growing and dividing uncontrollably; their growth is not regulated. Sentinel Lymph Node Biopsy A sentinel lymph node biopsy is a surgical procedure that helps doctors determine if or how far a cancer has spread within the body.