Quintarelli et al., reported that the presence in culture medium of IL-7 and IL-15 increases long-term in vitro proliferation and survival in SHSY5Y, and IMR-32 neuroblastoma cell lines and in vivo expansion of CAR-T cells targeting disialoganglioside (GD2) in a NSG mice that mimic neuroblastoma (Quintarelli et al., 2018). Here, IL15 is linked to neuroblastoma.