Coexistence of Serum Monoclonal Gammopathy of Uncertain Significance and Hodgkin Lymphoma.

An uncommon association between multiple myeloma and Hodgkin lymphoma (HL) was observed in some case reports, while an association with monoclonal gammopathy of uncertain significance (MGUS) is exceedingly rare. We have diagnosed 110 HL cases from 2008 to 2018; here we report 4 HL cases associated with MGUS. MGUS was diagnosed before HL (1 case), together with HL (1 case) or after HL (2 cases). M-component was IgG/k (3 cases) and IgG/k and IgG/λ (1 case), MGUS was not influenced by HL treatment (2 cases), raised after therapy (1 case), while in the last case MGUS appeared after ASCT while HL was in complete remission. We suggest to further study a possible link between MGUS and HL and to perform serum immunofixation if protein electrophoresis shows a suspected discrete band. The comprehension of pathophysiology of this association and a possible role of cytokines such as IL-6 and antilymphoma therapies such as nivolumab or ASCT to MGUS development could represent an interesting research field that requires further investigations.