Title: B-cell acute lymphoblastic leukemia following refractory multiple myelomaRunning title: ALL following refractory MMKey words: B-cell leukemia, myeloma, cytologyAuthors list : Radu Chiriac1, Valentin Pourchet11Hospices Civils de Lyon, Centre Hospitalier Lyon Sud, Laboratoire d’hématologie biologique, Pierre-Benite, FranceCorresponding author: Radu Chiriac ; Hospices Civils de Lyon, 69495 Pierre-Benite Cedex-France ; Tel: (33) 4 78 56 90 20; Fax: (33) 4 78 86 33 40 ; Email: radu.chiriac@chu-lyon.frAuthor contributions: RC and VP wrote the manuscript and conducted the cytological and cytometry studies. All authors contributed to the final manuscript.Data availability statement: Data sharing is not applicable to this article as no new data were created or analysed in this study.Funding statement: n/aConflict of interest statement: The authors have no conflict of interestEthics approval statement: This manuscript respects the ethic policy of CHU Lyon for the treatment of human research participants.Patient consent statement: No patient-identifying data were used. Written informed consent was obtained from the patient to publish this report in accordance with the journal’s patient consent policyPermission to reproduce material from other sources: The authors declare no use of third-party material in this study for which formal permission is requiredClinical trial registration : n/aWord count : 347Table count : 0Figure count : 1