CD19 and plasma cell myeloma: A 4-h coculture with CD20 CAR-T led to the complete eradication of CD20-expressing myeloma cells in these patients, showing that the exquisite antigen-sensitivity of CAR-T is not limited to CD19, but also applies to other target antigens (Fig. 4b–d, Supplementary Fig. 8, and Supplementary Table 3).