The purpose of this study is to describe the morbidity, mortality, disability and survival rate in Shanghai adolescents and children with cancer diagnosed since January 2002.

The investigators collected information of all the adolescents and children diagnosed cancer in Shanghai since January 2002, including their name, gender, the date of birth, the diagnosis date, disease diagnosis, residence address and the last follow-up time status (survival/death). The type of cancer included all malignant tumors such as Acute Lymphocytic Leukemia, Acute Myeloid Leukemia, Non-Hodgkin Lymphoma, Hodgkin Lymphoma, central nervous system tumors, Neuroblastoma, Wilms tumor and so on. Then the investigators would analyze the morbidity, mortality, disability and survival rate.

Inclusion Criteria:

• 0-19 year-old children and adolescents.
• Diagnosed cancer in Shanghai since January 2002.

Exclusion Criteria:

• Patients who were lost of follow-up.
• Patient's death wasn't caused by cancer or complications but by other accidents such as car accident, fell from a great height and so on.

Since January 2002 in Shanghai, 0-19 year-old children and adolescents diagnosed with cancer.