{Reference Type}: Journal Article {Title}: B cells! Don't go the wrong way in this tumor. {Author}: Pupier G;Sautès-Fridman C; {Journal}: Immunity {Volume}: 57 {Issue}: 7 {Year}: 2024 Jul 9 {Factor}: 43.474 {DOI}: 10.1016/j.immuni.2024.06.007 {Abstract}: The association of tertiary lymphoid structures (TLSs) with survival and immunotherapy response brought B cells to center stage. In a pan-cancer B cells atlas in Science, Ma et al. show that germinal center reaction generating anti-tumor antibody-secreting cells (ASCs) from B memory cells in mature TLSs co-exist in tumors with extra-follicular reaction generating auto-reactive ASCs from memory B cells in immature TLSs.