NCI Definition: Coexistence of Hodgkin and non-Hodgkin lymphoma in the same anatomic site. 
There is 1 clinical trial for composite lymphoma, of which 1 is open and 0 are completed or closed. Of the trial that contains composite lymphoma as an inclusion criterion, 1 is phase 2 (1 open).
Brentuximab vedotin, cyclophosphamide, and doxorubicin are the most common interventions in composite lymphoma clinical trials.
2. The AACR Project GENIE Consortium. AACR Project GENIE: powering precision medicine through an international consortium. Cancer Discovery. 2017;7(8):818-831. Dataset Version 6. This dataset does not represent the totality of the genetic landscape; see paper for more information.