Immunoglobulin rearrangement analysis from multiple lesions in the same patient using next-generation sequencing

Area of Science:

• Hematology
• Oncology
• Genetics

Background:

• Distinguishing between disseminated and multiple primary lymphomas is crucial for treatment decisions.
• Clonally related lymphomas require aggressive therapy, while unrelated lymphomas are treated with standard protocols.

Purpose of the Study:

• To evaluate next-generation sequencing (NGS) of immunoglobulin heavy gene V-D-J rearrangements for differentiating lymphoproliferative disorders.
• To assess the clinical utility of NGS in cases of multiple lymphomas with discordant pathology.

Main Methods:

• Utilized next-generation sequencing on the Ion Torrent Personal Genome Machine.
• Analyzed immunoglobulin heavy gene V-D-J rearrangements from formalin-fixed, paraffin-embedded tissue samples.
• Compared NGS results with fragment analysis of heavy and light chain rearrangements.

Main Results:

• NGS identified clonally related lesions in one patient, confirming disseminated lymphoma.
• NGS revealed clonally unrelated lesions in a second patient, indicating separate primary lymphomas.
• Fragment analysis failed to provide this crucial distinction in either case.

Conclusions:

• Next-generation sequencing of immunoglobulin rearrangements is a powerful diagnostic tool in lymphoproliferative disorders.
• NGS facilitates accurate clinical decision-making for patients with multiple simultaneous or subsequent lymphoproliferations.
• This technique surpasses current gold standards for assessing clonality in lymphoma diagnostics.