In the study of Storti et al., vaccine-induced T cell response (spike-specific CD4 + or CD8 + T cell producing at least one of the three cytokines of IL-2 or IFN-γ or TNF-α) in MM patients and pre-malignant-monoclonal-gammopathies was evaluated by flow cytometry. Here, IFNG is linked to monoclonal gammopathy.