Analysis of the individual radiosensitivity in pediatric oncology

Inclusion Criteria:

• Minor patient treated for a brain tumor, Ewing tumor, malignant mesenchymal tumor, neuroblastoma, nephroblastoma, Hodgkin's lymphoma treated with radiotherapy (+/- chemotherapy) for curative purposes.
• Children or adolescents > 3 years old and < 18 years old
• Patient with an indication for radiotherapy as part of the primary tumor local control strategy
• Theoretical indication for radiotherapy in standard fractionation (1.8 Gy to 2.2 Gy / fraction: 5 fr/week) whatever the technique and the particle used
• Patient affiliated with a social security scheme
• Patient and/or parents or holders of parental authority having dated and signed an informed consent

Exclusion criteria:

• Patients with contraindications to blood sampling
• Patients with contraindications to radiotherapy
• Palliative radiotherapy
• Patient with previous RT treatment in the same area (re-irradiation)
• Patient with an indication of hypofractionated RT
• Patient follow-up not possible
• Persons deprived of liberty or under guardianship (including curatorship)

Exclusion Criteria:

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