This study investigates rare tumors in children and adolescents. The study collects information about the tumors' clinical and biological characteristics to better understand them and how they affect treatment outcomes.
- Who can participate: Children and adolescents aged 0-18 years with a very rare tumor, either primary or relapsed, can participate if diagnosed or treated in a participating country or center. Consent from the patient or guardian is required.
- Study details: Participants will provide data on their medical condition and treatment. This information will help develop recommendations for diagnosis and treatment.
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