from Section 3 - Acute Lymphoblastic Leukemia/Lymphoma
Published online by Cambridge University Press: 20 May 2026
This chapter covers initial diagnosis of B-lymphoblastic leukemia (B-ALL), and measurable disease detection (MRD) post therapy by flow cytometry. The classic and variant immunophenotypic features of B-ALL are illustrated, correlated with molecular genetic characteristics, and summarized in a genotype-phenotype table. The key features are provided in the differential diagnosis of B-ALL with aberrant MPO versus mixed B/myeloid acute leukemia (MPAL), as well as B-ALL with a mature phenotype versus high grade B cell lymphoma. Under B-ALL MRD detection, the common immunophenotypic alterations are demonstrated by comparing them to normal immature B cells (hematogones). Strategies for MRD detection post targeted therapy are also discussed. The pros and cons of flow cytometry MRD are compared with molecular MRD, including NGS sequencing (Clonoseq) and BCR::ABL1 quantitative PCR. The challenges, including loss of lineage markers, lineage switch, and normal mimics, are discussed and illustrated under diagnostic pitfalls.
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