PMID- 31231669 OWN - NLM STAT- PubMed-not-MEDLINE LR - 20201001 IS - 2306-9759 (Print) IS - 2313-0792 (Electronic) IS - 2306-9759 (Linking) VI - 6 DP - 2019 TI - Lineage switch from T-cell lymphoblastic leukemia/lymphoma to acute myeloid leukemia and back to T-cell lymphoblastic leukemia/lymphoma in a patient diagnosed during pregnancy. PG - 12 LID - 10.21037/sci.2019.05.02 [doi] LID - 12 AB - Although relapse of acute leukemia is common, a change of immunophenotype at relapse only occurs rarely. Some of these cases have been labeled "lineage switch". In most cases, B-cell lymphoblastic leukemia/lymphoma (B-ALL) relapses as acute myeloid leukemia (AML). We report a rare case of T-cell acute lymphoblastic leukemia/lymphoma (T-ALL) relapsing as AML and then returning as T-ALL again in a patient who began her therapy during the third trimester of pregnancy. The patient retained the same cytogenetic and next generation molecular findings in both leukemias. This case provides further evidence of the plasticity of the leukemic stem cell. FAU - Aujla, Amandeep AU - Aujla A AD - Department of Medicine, New York Medical College and Westchester Medical Center, Valhalla, NY, USA. AD - Department of Hematology & Oncology, New York Medical College and Westchester Medical Center, Valhalla, NY, USA. FAU - Hanmantgad, Madhura AU - Hanmantgad M AD - Department of Medicine, New York Medical College and Westchester Medical Center, Valhalla, NY, USA. AD - Department of Hematology & Oncology, New York Medical College and Westchester Medical Center, Valhalla, NY, USA. FAU - Islam, Humayun AU - Islam H AD - Department of Pathology, New York Medical College and Westchester Medical Center, Valhalla, NY, USA. FAU - Shakil, Fouzia AU - Shakil F AD - Department of Pathology, New York Medical College and Westchester Medical Center, Valhalla, NY, USA. FAU - Liu, Delong AU - Liu D AD - Department of Medicine, New York Medical College and Westchester Medical Center, Valhalla, NY, USA. AD - Department of Hematology & Oncology, New York Medical College and Westchester Medical Center, Valhalla, NY, USA. FAU - Seiter, Karen AU - Seiter K AD - Department of Medicine, New York Medical College and Westchester Medical Center, Valhalla, NY, USA. AD - Department of Hematology & Oncology, New York Medical College and Westchester Medical Center, Valhalla, NY, USA. LA - eng PT - Case Reports DEP - 20190524 PL - China TA - Stem Cell Investig JT - Stem cell investigation JID - 101672113 PMC - PMC6556683 OTO - NOTNLM OT - Acute lymphoblastic leukemia (ALL) OT - acute myeloid leukemia (AML) OT - lineage switch OT - pregnancy OT - stem cell plasticity COIS- Conflicts of Interest: The authors have no conflicts of interest to declare. EDAT- 2019/06/25 06:00 MHDA- 2019/06/25 06:01 PMCR- 2019/05/24 CRDT- 2019/06/25 06:00 PHST- 2019/04/02 00:00 [received] PHST- 2019/05/15 00:00 [accepted] PHST- 2019/06/25 06:00 [entrez] PHST- 2019/06/25 06:00 [pubmed] PHST- 2019/06/25 06:01 [medline] PHST- 2019/05/24 00:00 [pmc-release] AID - sci-06-2019.05.02 [pii] AID - 10.21037/sci.2019.05.02 [doi] PST - epublish SO - Stem Cell Investig. 2019 May 24;6:12. doi: 10.21037/sci.2019.05.02. eCollection 2019.