 - The criteria for eligibility are broad because the ascertainment by the computerized FHQ does not allow for resolution of different types of lymphoma or different types of leukemia. Patient recall of this information is also imprecise. More accurate family history information will be obtained upon contact of family members and diagnoses will be verified by obtaining pathologic documentation. The spectrum of familial lymphoproliferative syndromes LPS may include all types of lymphoma as well as chronic lymphocytic leukemia. This is an additional reason to have a broad eligibility. Subset analysis will be performed on specific types of lymphoid neoplasms. DNA of patients with a family history of lymphoma who have consented to protocol 93-102 Ascertainment of Peripheral Blood or Saliva Samples for Genetic Epidemiology Studies of Familial Cancers will also be eligible for inclusion in this study. 