Karyotype evolution in B-cell lymphoid malignancy with an 8;14 translocation.

Area of Science:

• Cytogenetics
• Oncology
• Immunology

Background:

• The 8;14 translocation [t(8;14)(q24;q32)] is a recurring abnormality in B-cell malignancies.
• Karyotypic evolution plays a role in tumor progression and clinical presentation.

Purpose of the Study:

• To investigate the clinicopathologic features and immunologic phenotypes of B-cell malignancies with the t(8;14) translocation.
• To evaluate the significance of karyotypic evolution associated with t(8;14).

Main Methods:

• Analysis of karyotypic abnormalities in tumor cells from nine Japanese patients.
• Examination of clinicopathologic features and immunologic phenotypes (surface immunoglobulin expression).

Main Results:

• All patients with t(8;14) exhibited structural rearrangements of chromosome 1 long arm (1q), including translocations and tandem duplications, associated with partial trisomy 1q.
• Tumor cells lacking surface immunoglobulin expression had complex karyotypes with 1q translocations, while those expressing surface immunoglobulin had simpler karyotypes.
• 1q rearrangements were observed in Burkitt's lymphoma and other B-cell lymphomas, often associated with poor prognosis and extranodal metastases.

Conclusions:

• The t(8;14) translocation may define major routes in karyotypic evolution of B-cell tumors.
• Chromosome 1q rearrangements associated with t(8;14) are potential clinical risk factors.
• Morphologic presentation and surface immunoglobulin expression may correlate with the karyotypic evolution process.