MPO Expression of Background Neutrophils in MPO Negative Acute Promyelocytic Leukemia, An Easy Clue to Corroborate a Challenging Diagnosis: A Case Report and Review of Literature
Acute promyelocytic leukemia (APL) is characterized by the pathogenic driver fusion transcript PML-RARA resulting from the t(15;17) translocation. Early recognition of APL with prompt ATRA induction has a decisive impact on the early death rate. The preliminary diagnosis of APL relies heavily on cyt...
| Main Authors: | , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Hindawi Limited
2023-01-01
|
| Series: | Case Reports in Hematology |
| Online Access: | http://dx.doi.org/10.1155/2023/7979261 |
| _version_ | 1797367918169686016 |
|---|---|
| author | Kritika Krishnamurthy Jui Choudhuri K. H. Ramesh Yanhua Wang |
| author_facet | Kritika Krishnamurthy Jui Choudhuri K. H. Ramesh Yanhua Wang |
| author_sort | Kritika Krishnamurthy |
| collection | DOAJ |
| description | Acute promyelocytic leukemia (APL) is characterized by the pathogenic driver fusion transcript PML-RARA resulting from the t(15;17) translocation. Early recognition of APL with prompt ATRA induction has a decisive impact on the early death rate. The preliminary diagnosis of APL relies heavily on cytomorphology and flow cytometry. In APL with variant morphology, such as the microgranular variant, immunophenotype, especially the bright MPO positivity is the basis of diagnosis. Till date, only five cases of APL with reduced/absent MPO have been described in literature. The identification of MPO deficiency based on genetic testing would involve at the least a MPO gene scanning with NGS, followed by microarray to identify somatic uniparental disomy in heterozygotes. This testing is not only redundant given the scant clinical implications of heterozygous MPO deficiency but also time consuming. An easy way to identify background MPO deficiency confounding the immunophenotype of a myeloid neoplasm is the MPO expression in background neutrophils gated on the initial flow cytometry. A dim MPO in the background neutrophils, in the morphological setting of APL, can identify underlying MPO deficiency, clarifying the immunophenotypic ambiguity and thus establishing an unequivocal diagnosis as seen in the current case. |
| first_indexed | 2024-03-08T17:25:02Z |
| format | Article |
| id | doaj.art-c63b7e3e68c1432ab663408d8f155b76 |
| institution | Directory Open Access Journal |
| issn | 2090-6579 |
| language | English |
| last_indexed | 2024-03-08T17:25:02Z |
| publishDate | 2023-01-01 |
| publisher | Hindawi Limited |
| record_format | Article |
| series | Case Reports in Hematology |
| spelling | doaj.art-c63b7e3e68c1432ab663408d8f155b762024-01-03T00:00:03ZengHindawi LimitedCase Reports in Hematology2090-65792023-01-01202310.1155/2023/7979261MPO Expression of Background Neutrophils in MPO Negative Acute Promyelocytic Leukemia, An Easy Clue to Corroborate a Challenging Diagnosis: A Case Report and Review of LiteratureKritika Krishnamurthy0Jui Choudhuri1K. H. Ramesh2Yanhua Wang3Department of PathologyDepartment of PathologyDepartment of PathologyDepartment of PathologyAcute promyelocytic leukemia (APL) is characterized by the pathogenic driver fusion transcript PML-RARA resulting from the t(15;17) translocation. Early recognition of APL with prompt ATRA induction has a decisive impact on the early death rate. The preliminary diagnosis of APL relies heavily on cytomorphology and flow cytometry. In APL with variant morphology, such as the microgranular variant, immunophenotype, especially the bright MPO positivity is the basis of diagnosis. Till date, only five cases of APL with reduced/absent MPO have been described in literature. The identification of MPO deficiency based on genetic testing would involve at the least a MPO gene scanning with NGS, followed by microarray to identify somatic uniparental disomy in heterozygotes. This testing is not only redundant given the scant clinical implications of heterozygous MPO deficiency but also time consuming. An easy way to identify background MPO deficiency confounding the immunophenotype of a myeloid neoplasm is the MPO expression in background neutrophils gated on the initial flow cytometry. A dim MPO in the background neutrophils, in the morphological setting of APL, can identify underlying MPO deficiency, clarifying the immunophenotypic ambiguity and thus establishing an unequivocal diagnosis as seen in the current case.http://dx.doi.org/10.1155/2023/7979261 |
| spellingShingle | Kritika Krishnamurthy Jui Choudhuri K. H. Ramesh Yanhua Wang MPO Expression of Background Neutrophils in MPO Negative Acute Promyelocytic Leukemia, An Easy Clue to Corroborate a Challenging Diagnosis: A Case Report and Review of Literature Case Reports in Hematology |
| title | MPO Expression of Background Neutrophils in MPO Negative Acute Promyelocytic Leukemia, An Easy Clue to Corroborate a Challenging Diagnosis: A Case Report and Review of Literature |
| title_full | MPO Expression of Background Neutrophils in MPO Negative Acute Promyelocytic Leukemia, An Easy Clue to Corroborate a Challenging Diagnosis: A Case Report and Review of Literature |
| title_fullStr | MPO Expression of Background Neutrophils in MPO Negative Acute Promyelocytic Leukemia, An Easy Clue to Corroborate a Challenging Diagnosis: A Case Report and Review of Literature |
| title_full_unstemmed | MPO Expression of Background Neutrophils in MPO Negative Acute Promyelocytic Leukemia, An Easy Clue to Corroborate a Challenging Diagnosis: A Case Report and Review of Literature |
| title_short | MPO Expression of Background Neutrophils in MPO Negative Acute Promyelocytic Leukemia, An Easy Clue to Corroborate a Challenging Diagnosis: A Case Report and Review of Literature |
| title_sort | mpo expression of background neutrophils in mpo negative acute promyelocytic leukemia an easy clue to corroborate a challenging diagnosis a case report and review of literature |
| url | http://dx.doi.org/10.1155/2023/7979261 |
| work_keys_str_mv | AT kritikakrishnamurthy mpoexpressionofbackgroundneutrophilsinmponegativeacutepromyelocyticleukemiaaneasycluetocorroborateachallengingdiagnosisacasereportandreviewofliterature AT juichoudhuri mpoexpressionofbackgroundneutrophilsinmponegativeacutepromyelocyticleukemiaaneasycluetocorroborateachallengingdiagnosisacasereportandreviewofliterature AT khramesh mpoexpressionofbackgroundneutrophilsinmponegativeacutepromyelocyticleukemiaaneasycluetocorroborateachallengingdiagnosisacasereportandreviewofliterature AT yanhuawang mpoexpressionofbackgroundneutrophilsinmponegativeacutepromyelocyticleukemiaaneasycluetocorroborateachallengingdiagnosisacasereportandreviewofliterature |