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Published on: October 19, 2014
Immunophenotypic characterization of acute leukemias and chronic lymphoproliferative disorders: practical
1Laboratoire d'Hématologie, Institut de Biologie, Nantes, France.
Insights
Immunophenotyping is crucial for diagnosing acute leukemias (AL) and chronic lymphoproliferative disorders (CLPD). This technique classifies leukemias, aids in prognosis, and requires controlled methods for reliable results.
Area of Science:
- Hematology
- Clinical Pathology
- Immunology
Background:
- Immunophenotypic characterization is essential for diagnosing acute leukemias (AL) and chronic lymphoproliferative disorders (CLPD).
- It aids in classifying AL based on lineage, differentiation, and marker expression.
- Specific immunophenotypic profiles can indicate prognosis and cytogenetic abnormalities.
Purpose of the Study:
- To highlight the importance of immunophenotyping in classifying leukemias.
- To discuss the role of immunophenotyping in diagnosing rare AL subtypes and biphenotypic leukemias.
- To emphasize the prognostic value of immunophenotypic profiles in AL and CLPD.
Main Methods:
- Classification of AL by lineage assignment, differentiation level, and marker specificity.
- Identification of rare AL subtypes (M0, M6 variant, M7 FAB) and biphenotypic AL.
- Correlation of lymphoid cell immunophenotypic profiles with morphology in CLPD.
Main Results:
- Immunophenotyping enables precise classification of AL and identification of rare subtypes.
- Specific immunophenotypic profiles are linked to prognostic value and cytogenetic abnormalities.
- Circulating lymphoid cell profiles correlate with morphology in CLPD, offering prognostic insights.
Conclusions:
- Accurate immunophenotyping is vital for AL and CLPD diagnosis and classification.
- The choice of sample, antibodies, and methods is critical for result quality and reproducibility.
- Controlled laboratory practices are necessary for reliable immunophenotypic analysis.
Abstract:
Immunophenotypic characterization of leukemic cells has become essential for the diagnosis of acute leukemias (AL) and chronic lymphoproliferative disorders (CLPD). Immunophenotyping allows to classify AL according to (i) lineage assignment of the leukemic clone based on the degree of specificity (or "score") of expressed markers, (ii) the differentiation level of the clone and (iii) the presence of irrelevant markers. In addition, some rare AL subtypes may be identified, such as M0, M6 "variant" and M7 FAB types, as well as "biphenotypic" (hybrid) AL. Finally particular immunophenotypic profiles are of pronostic value or associated with specific cytogenetic abnormalities. In leukemic phase CLPD setting, some circulating lymphoid cell immunophenotypic profiles are strongly correlated with morphology as defined by the FAB and REAL classifications. In addition, some marker expressions are of pronostic value. However, proper choices of sample nature, monoclonal antibodies and immunophenotyping methods are essential to improve quality, reliability and reproducibility of the results and must be carefully controlled in and between laboratories.
