Primary Outcome Measures
- Epidemiology
- Use of International Recommendations
- Survival of children and adolescents (0-18 years) affected by Very Rare Tumors
Inclusion Criteria
- Children and adolescents (age 0-18 years) with a primary or relapsed Very Rare Tumor diagnosed and/or treated in a participating country/center.
- Written informed consent from the patient and/or the parent/legal guardian
Exclusion Criteria
- Absence of Written informed consent from the patient and/or the parent/legal guardian