Scheidler L, Hippe K, Ghimire S, Weber D, Weber M, Meedt E, Hoffmann P, Lehn P, Burkhardt R, Mamilos A, Edinger M, Wolff D, Poeck H, Evert M, Gessner A, Herr W, Holler E. Intestinal IgA-positive plasma cells are highly sensitive indicators of alloreaction early after allogeneic transplantation and associate with both graft-versus-host disease and relapse-related mortality. Haematologica 2023;108(11):2993-3000; https://doi.org/10.3324/haematol.2022.282188.