B-acute lymphoblastic leukemia/lymphoblastic lymphoma.
OBJECTIVE
This session of the 2013 Society of Hematopathology/European Association for Haematopathology Workshop was dedicated to B-acute lymphoblastic leukemia (B-ALL)/lymphoblastic lymphoma (LBL) with recurrent translocations and not otherwise specified.


METHODS
In this review, we summarize the cases discussed during the workshop, review the pertinent and most recent literature on the respective topics, and provide a few key points that may aid in the workup of patients with B-ALL/LBL.


RESULTS
Many of the submitted cases showed interesting diagnostic, immunophenotypic, or clinical aspects of B-ALL with BCR/ABL1, MLL-associated, and other recurrent chromosomal abnormalities. Several cases showed rare aberrancies such as coexistent IGH/BCL2 and MYC rearrangements and raised issues in classification. Other cases had unusual clinical presentations, including B-ALL with hypereosinophilia and therapy-related B-ALL. Several cases highlighted the role of flow cytometry immunophenotyping in distinguishing benign B-cell precursors from aberrant lymphoblasts, and other cases raised questions regarding the clinical importance of myeloperoxidase positivity in acute lymphoblastic leukemia.


CONCLUSIONS
The complexity and spectrum of cases presented in this review highlight the importance of clinicopathologic correlation and the value of ancillary studies in the classification and workup of patients with B-ALL/LBL.
From the Department of Hematopathology, The University of Texas MD Anderson Cancer Center, Houston; and.
Sanam
S
Loghavi
Infinity Pharmaceuticals, Cambridge, MA.
Jeffery L
JL
Kutok
From the Department of Hematopathology, The University of Texas MD Anderson Cancer Center, Houston; and jljorgen@mdanderson.org.
Jeffrey L
JL
Jorgensen
D000818:Animals; D001402:B-Lymphocytes / Q000166:cytology*; D002869:Chromosome Aberrations; D006801:Humans; D016130:Immunophenotyping / Q000379:methods; D016393:Lymphoma, B-Cell / Q000150:complications / Q000175:diagnosis / Q000473:pathology*; D054198:Precursor Cell Lymphoblastic Leukemia-Lymphoma / Q000150:complications / Q000175:diagnosis / Q000473:pathology*; D054448:Precursor Cells, B-Lymphoid / Q000166:cytology*
B-ALL; Cytogenetics; Flow cytometry immunophenotyping; Myeloid