Genetic Study of Familial Acute Lymphoblastic Leukemia

This study entails clinical interviews, submission of a peripheral germline blood sample for non-tumor DNA and permission to perform biologic studies on previously stored tumor tissue if applicable and available. Participants diagnosed with cancer at outside institutions will be requested to sign a release form to allow the outside institution to send germline and/or tumor tissue to St Jude if available. For patients who have undergone a stem cell transplant, a buccal swab or saliva sample will be requested (for germline DNA). For patients with active leukemia, non-tumor cells (for germline DNA) may be obtained using a remission blood sample, a skin biopsy (to obtain fibroblasts) or may be purified by fluorescence activated cell sorting of leukemia samples. The skin biopsy will be obtained in participants 18 years of age and older. In participants less than 18 years, the skin biopsy will be accessed only if it was already collected as part of another research protocol or for clinical care. All patients being considered for enrollment will have a clinical genetics consult by one of the study team members at which time a family history will be taken and information about genomic testing will be introduced. Detailed medical history will be obtained which includes but is not limited to demographics, clinical data including laboratory results, cancer history/diagnosis, treatment outcomes, environmental exposures and cancer risk factors to enable phenotype/genotype correlations.