The three types of children’s cancers are leukemia (cancer of the blood), lymphoma (cancer of the immune system) and solid tumors (cancer of bone, organs or tissues). Leukemia accounts for 30 percent of all childhood cancer cases. Symptoms typically include bone and joint pain, fatigue, weakness, pale skin, bleeding or bruising, fever and weight loss. The two main types of lymphoma are Hodgkin and non-Hodgkin, typically affecting the lymph nodes and other lymph tissues. Hodgkin lymphoma accounts for three percent of childhood cancers while non-Hodgkin lymphoma makes up around five percent. A solid tumor develops when sick cells get stuck together in a lump. Examples of solid tumors include Wilms tumor, brain and spinal cord tumors and neuroblastoma. Treatment for childhood cancer typically involves surgery, radiation therapy and chemotherapy. Organizations exist to provide support and resources to individuals and families experiencing childhood cancer.