Isolated thrombocytosis with BCR::ABL1 gene rearrangement – a distinct entity or a variant of chronic myelogenous leukemia (CML)? Case report and review of literature

•Isolated thrombocytosis with BCR::ABL1 is rare.•Most cases are asymptomatic.•BCR::ABL1 gene rearrangement is confined to megakaryocytes.•qPCR is most efficient in diagnosis of BCR::ABL1 gene rearrangement.•Timely diagnosis is vital for targeted therapy. Chronic myeloid leukemia (CML) with isolated...

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Vydáno v:Human Pathology Reports Ročník 41; s. 300785
Hlavní autoři: Prajapati, Vipulkumar, Flores, Raina R., Nooruddin, Zohra I., Medina, Edward A., Purnell, Gabriel, Ehman, William, Rodriguez, Juana, Kane, Sheila, Ortega, Veronica, Velagaleti, Gopalrao V.N.
Médium: Journal Article
Jazyk:angličtina
Vydáno: Elsevier Inc 01.09.2025
Elsevier
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ISSN:2772-736X, 2772-736X
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Abstract •Isolated thrombocytosis with BCR::ABL1 is rare.•Most cases are asymptomatic.•BCR::ABL1 gene rearrangement is confined to megakaryocytes.•qPCR is most efficient in diagnosis of BCR::ABL1 gene rearrangement.•Timely diagnosis is vital for targeted therapy. Chronic myeloid leukemia (CML) with isolated thrombocytosis and the absence of other significant morphological and/or clinical features of CML poses a diagnostic dilemma. Thrombocytosis in the setting of CML is usually accompanied by significant leukocytosis (usually above 25 K/mcL), prompting testing to detect the disease-defining BCR::ABL1 gene rearrangement, which is present in multiple hematopoietic lineages. In CML cases with isolated thrombocytosis, patients present without symptoms and the thrombocytosis is typically discovered incidentally. In contrast to classic cases of CML, cases with isolated thrombocytosis have shown that the abnormal clone is confined to the megakaryocyte lineage resulting in a normal conventional karyotype and FISH results, if performed on the peripheral blood. Here, we report another case of this rare entity and review the literature. We also suggest that this entity may deserve a separate and distinct entry in the WHO classification of tumors of hematopoietic and lymphoid tissues.
AbstractList •Isolated thrombocytosis with BCR::ABL1 is rare.•Most cases are asymptomatic.•BCR::ABL1 gene rearrangement is confined to megakaryocytes.•qPCR is most efficient in diagnosis of BCR::ABL1 gene rearrangement.•Timely diagnosis is vital for targeted therapy. Chronic myeloid leukemia (CML) with isolated thrombocytosis and the absence of other significant morphological and/or clinical features of CML poses a diagnostic dilemma. Thrombocytosis in the setting of CML is usually accompanied by significant leukocytosis (usually above 25 K/mcL), prompting testing to detect the disease-defining BCR::ABL1 gene rearrangement, which is present in multiple hematopoietic lineages. In CML cases with isolated thrombocytosis, patients present without symptoms and the thrombocytosis is typically discovered incidentally. In contrast to classic cases of CML, cases with isolated thrombocytosis have shown that the abnormal clone is confined to the megakaryocyte lineage resulting in a normal conventional karyotype and FISH results, if performed on the peripheral blood. Here, we report another case of this rare entity and review the literature. We also suggest that this entity may deserve a separate and distinct entry in the WHO classification of tumors of hematopoietic and lymphoid tissues.
Highlights•Isolated thrombocytosis with BCR::ABL1 is rare. •Most cases are asymptomatic. •BCR::ABL1 gene rearrangement is confined to megakaryocytes. •qPCR is most efficient in diagnosis of BCR::ABL1 gene rearrangement. •Timely diagnosis is vital for targeted therapy.
Chronic myeloid leukemia (CML) with isolated thrombocytosis and the absence of other significant morphological and/or clinical features of CML poses a diagnostic dilemma. Thrombocytosis in the setting of CML is usually accompanied by significant leukocytosis (usually above 25 K/mcL), prompting testing to detect the disease-defining BCR::ABL1 gene rearrangement, which is present in multiple hematopoietic lineages. In CML cases with isolated thrombocytosis, patients present without symptoms and the thrombocytosis is typically discovered incidentally. In contrast to classic cases of CML, cases with isolated thrombocytosis have shown that the abnormal clone is confined to the megakaryocyte lineage resulting in a normal conventional karyotype and FISH results, if performed on the peripheral blood.Here, we report another case of this rare entity and review the literature. We also suggest that this entity may deserve a separate and distinct entry in the WHO classification of tumors of hematopoietic and lymphoid tissues.
ArticleNumber 300785
Author Purnell, Gabriel
Flores, Raina R.
Prajapati, Vipulkumar
Velagaleti, Gopalrao V.N.
Kane, Sheila
Nooruddin, Zohra I.
Rodriguez, Juana
Medina, Edward A.
Ehman, William
Ortega, Veronica
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Keywords FISH
qPCR
Megakaryocytes
Isolated thrombocytosis with BCR::ABL1 gene rearrangement
Language English
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Snippet •Isolated thrombocytosis with BCR::ABL1 is rare.•Most cases are asymptomatic.•BCR::ABL1 gene rearrangement is confined to megakaryocytes.•qPCR is most...
Highlights•Isolated thrombocytosis with BCR::ABL1 is rare. •Most cases are asymptomatic. •BCR::ABL1 gene rearrangement is confined to megakaryocytes. •qPCR is...
Chronic myeloid leukemia (CML) with isolated thrombocytosis and the absence of other significant morphological and/or clinical features of CML poses a...
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StartPage 300785
SubjectTerms FISH
Isolated thrombocytosis with BCR::ABL1 gene rearrangement
Megakaryocytes
Pathology
qPCR
Title Isolated thrombocytosis with BCR::ABL1 gene rearrangement – a distinct entity or a variant of chronic myelogenous leukemia (CML)? Case report and review of literature
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