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Published on: April 16, 2013
Peripheral Blood as a Diagnostic Alternative to Bone Marrow in Immunophenotyping Pediatric B-Cell Acute Lymphoblastic
Alberto Daniel Saucedo-Campos1, Maria Jose Lopez Chee1, Myriam Campos-Aguilar1
1Laboratorio de Inmunología (UMF), Facultad de Estudios Superiores Iztacala, Universidad Nacional Autónoma de México, Los Barrios N° 1, Los Reyes Iztacala, Tlalnepantla 54090, Mexico.
Insights
Peripheral blood analysis for childhood B-cell acute lymphoblastic leukemia (B-ALL) shows moderate concordance with bone marrow, especially for key diagnostic markers. This finding supports using peripheral blood in high-burden cases, reducing invasive procedures.
Area of Science:
- Hematology
- Immunology
- Pediatric Oncology
Background:
- Flow cytometric immunophenotyping is crucial for diagnosing childhood B-cell acute lymphoblastic leukemia (B-ALL).
- Traditionally, bone marrow aspirates are used, but this invasive procedure can be challenging.
- Peripheral blood may serve as an alternative for initial classification when circulating blasts are present.
Purpose of the Study:
- To evaluate the immunophenotypic concordance between peripheral blood and bone marrow in pediatric B-ALL.
- To quantify marker-specific agreement between these sample types.
- To identify clinical factors influencing concordance.
Main Methods:
- Paired peripheral blood and bone marrow samples from 32 newly diagnosed pediatric B-ALL patients were analyzed.
- A standardized panel of B-lineage and maturation markers was used.
- Concordance and bias between compartments were assessed.
Main Results:
- Overall concordance was moderate (mean CCC ~0.63).
- High concordance (>95%) with minimal bias was observed for key diagnostic markers (CD19, CD10, CD34, HLA-DR).
- Greater concordance was noted in patients with hemoglobin < 8 g/dL and those older than 10 years.
Conclusions:
- Peripheral blood immunophenotyping is reliable for key diagnostic markers in high-burden pediatric B-ALL.
- This approach can reduce the need for invasive bone marrow procedures, facilitating timely classification.
- Peripheral blood analysis is particularly valuable in resource-limited settings or when rapid treatment initiation is critical.
Abstract:
Flow cytometric immunophenotyping is essential for the diagnosis and immunologic classification of B-cell acute lymphoblastic leukemia in children and is traditionally performed using bone marrow aspirates, an invasive procedure that may be delayed or unavailable in certain clinical contexts. However, many patients present with circulating blasts at diagnosis, raising the possibility of using peripheral blood as an alternative source for initial immunophenotypic classification. Although previous studies have shown that peripheral blood can support initial diagnostic classification, they have not determined the degree of marker-level concordance between peripheral blood and bone marrow nor the clinical conditions under which this concordance is strongest. In this study, we evaluated the immunophenotypic concordance between peripheral blood and bone marrow in 32 pediatric patients with B-cell acute lymphoblastic leukemia, using paired samples obtained at diagnosis and analyzed with a standardized panel of B-lineage and maturation markers. Accordingly, the objective of this study was to quantify marker-specific agreement between compartments and identify clinical factors associated with higher concordance. Overall concordance was moderate across all subpopulations (mean CCC ~0.63) but higher for the markers most relevant to routine diagnostic classification (e.g., CD19+, CD10+, CD34+, and HLA-DR+), several of which exceeded 95% concordance and showed minimal bias between specimens. These findings apply only to newly diagnosed B-ALL with sufficient circulating blasts, as cases with minimal residual disease, low-blast presentations, atypical immunophenotypes, or mixed-lineage leukemias were not included in this study. The greatest concordance was seen in patients with hemoglobin < 8 g/dL, in whom extensive marrow infiltration promotes blast spillover into circulation. Likewise, patients older than 10 years showed high concordance, consistent with greater leukemic burden at presentation. Even in subgroups with lower circulating blast levels, such as those with hemoglobin ≥ 8 g/dL, peripheral blood adequately reproduced most leukemic cell populations present in bone marrow. Overall, these findings indicate that the markers and subpopulations most relevant for diagnostic immunophenotyping can be reliably assessed using peripheral blood in high-burden disease settings, reducing the immediate need for invasive procedures and facilitating timely immunophenotypic classification, particularly in resource-limited environments or situations where rapid initiation of treatment is critical.
