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Four aged siblings with B cell chronic lymphocytic leukemia
F Fernhout1, R B Dinkelaar, A Hagemeijer
1Department of Clinical Chemistry, Lorentz Hospital Zeist, The Netherlands.
Leukemia
|February 3, 1998
Summary
This study investigated four elderly siblings with B cell chronic lymphocytic leukemia (B-CLL), finding six distinct B-CLL cases and biclonality in two patients. The family shows high susceptibility to B-CLL, with CD8 expression noted in two cases.
Area of Science:
- Hematology
- Oncology
- Genetics
Background:
- Familial clustering of B cell chronic lymphocytic leukemia (B-CLL) is rare.
- Understanding the genetic and immunological basis of B-CLL in families is crucial for identifying susceptibility factors.
Purpose of the Study:
- To investigate the immunological and genetic characteristics of B-CLL in four elderly siblings.
- To determine if common factors contribute to B-CLL development within this family.
- To explore the significance of biclonality and CD8 expression in B-CLL.
Main Methods:
- Immunological marker analysis.
- Southern blot analysis of immunoglobulin (Ig) genes.
- Cytogenetic studies.
Main Results:
- All four siblings were diagnosed with B-CLL, with evidence of six distinct B-CLL cases identified through combined analyses.
- Two patients exhibited biclonal Ig gene rearrangement and cytogenetic aberrations, indicating two independent B-CLL clones.
- CD8 antigen expression was observed on B-CLL cells in the two oldest patients, a rare finding not associated with aggressive disease in this cohort.
Conclusions:
- The family demonstrates a high susceptibility to developing B-CLL, although a specific common causative factor remains unidentified.
- The presence of multiple B-CLL clones (biclonality) and CD8 expression can occur in B-CLL without necessarily indicating a more aggressive clinical course.
- This case series highlights the complexity of B-CLL development and suggests potential genetic predispositions within families.