Identification of New Immune Factors Specific of Relapse in Childhood B Lineage Acute Lymphoblastic Leukemia

Inclusion Criteria

• •* Children aged from 1 to 18 years at the time of first B-ALL relapse diagnosis
• •* Obtention of oral and written consent of the parents
• •* Parents affiliated with the social security system
• •* Children aged from 1 to 18 years enrolled into FRALLE or EORTC treatment protocols, treated for B-ALL and who are in complete molecular remission
• •* Obtention of oral and written consent of the parents
• •* Parents affiliated with the social security system