Establishing a Tumor Bank in Families With Multiple Lymphoproliferative Malignancies

* Patients who participate will be asked to complete detailed family and medical history questionnaires initially, with a follow-up questionnaire every year. * Patients will be asked to supply a blood sample and possibly a mouthwash sample, both of which can be done by mail. * Patients will be asked to consent to the release of their lymphoma tissue block for the purposes of the study. * Patients will be given letters of invitation for their affected relatives to invite them to participate.