Familial chronic lymphocytic leukemia.

Area of Science:

• Hematology
• Genetics
• Oncology

Background:

• Familial aggregation of chronic lymphocytic leukemia (CLL) and related B-cell tumors is well-documented.
• Despite familial clustering, specific predisposing germline mutations for CLL have not yet been identified.
• Monoclonal B-cell lymphocytosis, a precursor to CLL, also shows familial aggregation.

Purpose of the Study:

• To review the spectrum of conditions associated with familial CLL.
• To discuss advances in identifying genetic susceptibility genes for CLL.
• To explore the genetic basis of familial CLL and related B-cell malignancies.

Main Methods:

• Genome-wide linkage studies in high-risk CLL families.
• Association studies of candidate genes.
• Whole-genome association studies (WGAS) in CLL patients and families.

Main Results:

• Familial CLL generally shares prognostic markers and clinical outcomes with sporadic CLL, potentially presenting as more indolent disease.
• Linkage studies have screened the genome for susceptibility loci but have not yet pinpointed specific mutations.
• Association and WGAS studies suggest potential candidate genes, with WGAS results showing promise for future discoveries.

Conclusions:

• Large-scale genomic studies in CLL patients and families are crucial for identifying susceptibility genes.
• Identifying these genes will elucidate causal pathways in CLL development.
• Future research will leverage genomic approaches to uncover the genetic underpinnings of familial CLL.