This series on “Marginal Zone Lymphomas” is edited by Dr. Francesco Bertoni from Institute of Oncology Research and Oncology Institute of Southern Switzerland, Bellinzona, Switzerland; Dr. Davide Rossi from Institute of Oncology Research, Bellinzona, Switzerland; Dr. Thomas M. Habermann from Mayo Clinic, Minnesota, USA; and Dr. Emanuele Zucca from Institute of Oncology Research and Oncology Institute of Southern Switzerland, Bellinzona, Switzerland.

From April 17–18, 2019, the Lymphoma Research Foundation (LRF) gathered international experts including members of the International Extranodal Study Group in the field of MZL in New York City for the inaugural International Scientific Workshop on Marginal Zone Lymphoma. This group collectively realized that there was far more to be learned and accomplished in MZL.

One outcome of this Workshop is this focused issue on MZL which serves as the most extensive and comprehensive review of individual topics in MZL by international leaders in the field. We hope that it will provide a roadmap taking us from where the field currently is, to where it is going, but, more importantly where it will need to go to lead to the cure of patients with MZL.