Chronic lymphocytic leukemia with associated lambda-light-chain and IgG lambda paraproteins simulating a biclonal...

Area of Science:

• Hematology
• Immunology
• Oncology

Background:

• Monoclonal components (MCs) are common in B-cell malignancies, detected by increasingly sensitive methods.
• Multiple serum paraproteins are rarely reported in chronic lymphocytic leukemia (CLL).

Observation:

• A 71-year-old woman with CLL presented with two distinct serum monoclonal components (MCs).
• Immunofixation identified IgGlambda and lambda light chains in serum, and lambda light chains in urine.
• Serum lambda free light chains (FLCs) were elevated at 206 mg/L.

Findings:

• Bone marrow biopsy confirmed CLL (Rai stage I) with 38% infiltration of mature lymphocytes expressing IgG lambda.
• The patient had no significant plasma cell infiltration.
• The patient survived for three years without CLL-specific therapy, eventually dying of myocardial infarction.

Implications:

• The presence of double MCs in CLL may indicate unbalanced immunoglobulin chain synthesis by the leukemic clone.
• This imbalance can lead to excess free light chains (FLCs).
• Further research into MCs in CLL could refine diagnostic and prognostic markers.