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The diagnostic utility of immunophenotyping and immunogenotyping in the pathologic evaluation of lymphoid
D Kamat1, M J Laszewski, J D Kemp
1Department of Pathology, University of Iowa, Iowa City.
Insights
Immunophenotyping aids diagnosis in about 50% of challenging lymphoma and leukemia cases. Genotyping further assists in resolving difficult diagnoses when morphology and immunophenotyping are insufficient.
Area of Science:
- Hematology
- Oncology
- Pathology
Background:
- Morphological examination is the primary method for diagnosing lymphoma and lymphocytic leukemia.
- Diagnostic challenges arise with ambiguous or undifferentiated cell morphologies.
- Immunophenotyping and genotyping offer advanced tools for resolving complex hematologic malignancies.
Purpose of the Study:
- To determine the diagnostic utility of immunophenotyping and genotyping in cases of suspected lymphoma and lymphocytic leukemia.
- To quantify the frequency with which these techniques resolve diagnostic problems unresolved by morphology alone.
Main Methods:
- Examination of 182 specimens of suspected lymphoma and lymphocytic leukemia.
- Utilized morphology, immunophenotyping, and immunogenotyping (genotyping) for diagnostic analysis.
- Focused on cases with morphological diagnostic challenges.
Main Results:
- Sixty-five of 182 cases presented morphological diagnostic problems.
- Immunophenotyping resolved diagnostic issues in 33 of these 65 cases (approximately 50%).
- Genotyping further resolved diagnoses in 16 of the remaining 32 problem cases.
Conclusions:
- Immunophenotyping is effective in resolving approximately half of morphologically challenging lymphoma and leukemia cases.
- Genotyping provides significant diagnostic value in a subset of cases where morphology and immunophenotyping are inconclusive.
- Combined application of these techniques enhances diagnostic accuracy for hematologic neoplasms.
Abstract:
One hundred eighty-two specimens of suspected lymphoma and lymphocytic leukemia were examined by morphology, immunophenotype, and immunogenotype (genotype) in order to answer the following questions: How often and in what situations does immunophenotyping help resolve a diagnostic problem that is not resolved by morphology? How frequently does genotyping help resolve a diagnostic problem that is not resolved by morphology and immunophenotyping? Of 182 cases for which fresh tissue was available, sixty-five cases were considered morphological diagnostic problems: There were 32 cases of neoplasia versus non-neoplastic proliferation, 16 cases of neoplasia with undifferentiated or ambiguous morphology, and 17 cases of lymphoma or lymphocytic leukemia with an uncertain subtype. Immunophenotyping helped to resolve 33 of these 65 cases. Of the remaining 32 cases genotyping helped to resolve the diagnosis in 16. These results suggest that immunophenotyping may diagnose approximately 50% of those cases which present a morphological problem, and that genotyping is also helpful in a limited but significant number of problem cases.
