IMpact of Mind-body Therapies (HYpnosis and Relaxation) on Anxiety in Children, Adolescents and Young Adults Who Had Been Treated in ONcology. Multicenter Study.

Inclusion Criteria: HARMONY KIDS * Patients aged at least 7 and under 15 at the time of inclusion, diagnosed with pediatric cancer, * Patients considered to be in complete remission from pediatric cancer, whose intensive treatment ended at least 3 months prior to inclusion * Patients receiving follow-up care after pediatric cancer at one of the participating centers, * Patients with anxiety disorders (SCARED-R score ≥ 31) * Patients affiliated with or eligible for social security, * Patients and their parents (or legal guardians) who have received informed consent about the study and co-signed, with the investigator, a consent form to participate in the study. HARMONY AYA * Patients aged at least 15 and no more than 25 years old at the time of inclusion, diagnosed with pediatric cancer before the age of 18, * Patients considered to be in complete remission from pediatric cancer, whose intensive treatment ended at least 3 months prior to inclusion, * Patients receiving follow-up care after pediatric cancer at one of the participating centers, * Patients with anxiety disorders (HADS-Anxiety score ≥ 8) * Patients affiliated with or eligible for social security, * For adult patients: patients who have received informed information about the study and have co-signed, with the investigator, a consent form to participate in the study, * For minors: patients and their parents (or legal guardians) who have received informed consent about the study and have co-signed, with the investigator, a consent form for participation in the study. Exclusion criteria: For HARMONY-Kids: * Presence of active suicidal ideation and/or need for urgent psychiatric care, * Patient experiencing a cancer relapse, * Refusal to participate, * Pregnant women, women in labor, or breastfeeding mothers, * Individuals deprived of their liberty, hospitalized without consent, or hospitalized for purposes other than research, * Individuals subject to legal guardianship or conservatorship, or those unable to give informed consent For HARMONY-AYA: * Presence of active suicidal ideation and/or need for urgent psychiatric care, * Patients experiencing a cancer relapse, * Refusal to participate, * Pregnant women, women in labor, or breastfeeding mothers, * Individuals deprived of their liberty, hospitalized without consent, or hospitalized for purposes other than research, * Adults subject to legal guardianship or conservatorship, or unable to give informed consent.