Rearrangement of BCR genes in malignant lymphoma.

Area of Science:

• Oncology
• Genetics
• Hematology

Background:

• The Philadelphia chromosome (Ph) is a hallmark of chronic myelogenous leukemia (CML).
• Ph chromosome presence has been observed in other hematologic malignancies, including acute leukemias and lymphomas.
• Ph chromosome arises from a reciprocal translocation between chromosomes 9 and 22, involving the BCR and c-abl genes.

Purpose of the Study:

• To investigate the incidence of BCR gene rearrangements in patients with malignant lymphoma.
• To determine if BCR gene rearrangements are present in lymphoma without a prior CML diagnosis.

Main Methods:

• Southern blot analysis was performed on biopsy specimens.
• Analysis targeted BCR gene rearrangements.
• Specimens were from 49 patients with malignant lymphoma and no documented CML phase.

Main Results:

• BCR gene rearrangements were detected in two patients' malignant lymph nodes, but not bone marrow.
• One patient exhibited BCR gene rearrangements in bone marrow, but not in lymph nodes.
• The study suggests a similar incidence of BCR gene rearrangement in malignant lymphoma as in adult acute myeloid leukemia (AML).

Conclusions:

• BCR gene rearrangements can occur in malignant lymphoma, independent of a CML phase.
• The distribution of these rearrangements may vary between lymph nodes and bone marrow.
• The incidence appears comparable to that seen in adult AML, warranting further investigation.