CAYA Cancer Retrospective Cohort Study

Inclusion Criteria:

Subjects must meet all the following criteria to be included in this registry:

1. Participants must be willing and able to provide informed consent prior to enrollment in the registry.

   1. For minors or individuals unable to provide informed consent, assent must be obtained along with consent from a legal guardian.
   2. Note: Exemption applies to this criterion when waiver of informed consent/assent is granted by Institutional Review Board(IRB)/Independent Ethics Committee(IEC)/Competent Authorities(CAs).
2. A confirmed diagnosis of any type of cancer within the 15 years prior to the site's activation date.
3. Age 0 to 21 years at the time of diagnosis.
4. Received substantial anti-cancer treatment at the participating center, including but not limited to:

   1. Chemotherapy
   2. Surgery
   3. Radiation therapy
   4. Immunotherapy
5. Medical records are available and accessible for review

Exclusion Criteria:

* Subjects meeting any of the following criteria will be excluded from this registry:

  1. Patients who only visited the participating center for:

     1. Consultation without subsequent primary anti-cancer treatment at the participating center
     2. Pathology, radiology, or other diagnostic evaluations without treatment