The C2 cluster of cells were follicular B cells (MS4A1/CD20 and CD79A/B), which were found in lymphoid follicles of tertiary lymphatic structure within the tumor, and C0 and C4 clusters were antibody-secretory cells (MZB1 and SDC1/CD138) (Figures 7A, B). Here, SDC1 is linked to neoplasm.