InterLymph is organized into Working Groups, which promote collaborative projects in specific areas of research. Working Groups are based on specific etiologic research areas (e.g. environment and lifestyle, genetics) and lymphoid neoplasm subtypes (e.g. Multiple Myeloma, Hodgkin lymphoma). Each working group selects one or more Chairs. Participation in all Working Groups is open to all InterLymph members. Chairs will inform all InterLymph Working Group members of the activities of the respective Working Group and report to InterLymph members at large at InterLymph Annual Meetings. Changes to the Working Group structure must be approved by the Coordinating Committee and by InterLymph members at large at the subsequent Annual Meeting.