INCLUSION CRITERIA  Patients having a confirmed diagnosis of either:  A) Hodgkin lymphoma B) Aggressive B-cell lymphoma (e.g. Burkitt's lymphoma, diffuse large B-cell lymphoma, grade 3b follicular lymphoma, de novo transformed follicular lymphoma) C) Indolent B-cell lymphoma (e.g. all grades of follicular lymphoma except grade 3b, marginal zone lymphoma, lymphoplasmacytic lymphoma, chronic or small lymphocytic lymphoma, mantle cell lymphoma) D) Mature T/NK-cell malignancy (any subtype)  Patient must be ≥ 18 years. Patients will have provided written Informed Consent.  EXCLUSION CRITERIA  1) Serious medical or psychiatric illness likely to affect participation or that may compromise the ability to give informed consent.