Features of extramedullary myeloma relapse: high proliferation, minimal marrow involvement, adverse cytogenetics: a retrospective single-center study of 24 cases. - Rasche L; Bernard C; Topp MS; Kapp M; Duell J; Wesemeier C; Haralambieva E; Maeder U; Einsele H; Knop S (Annals of Hematology, 2012)