A patient presents with cervical lymphadenopathy. Biopsy demonstrates a nodular lymphoma with follicle formation. This lesion would most likely be associated with which of the following?
**Core Concept**
Nodular lymphomas with follicle formation, such as follicular lymphoma, are a type of non-Hodgkin lymphoma characterized by the presence of follicular dendritic cells and neoplastic B cells. This specific type of lymphoma is often associated with genetic alterations involving the BCL-2 gene.
**Why the Correct Answer is Right**
The correct answer is B. bcl-2 activation. In follicular lymphoma, a characteristic genetic abnormality is the t(14;18) translocation, which leads to the juxtaposition of the BCL-2 gene with the immunoglobulin heavy chain gene enhancer. This results in the overexpression of the anti-apoptotic protein BCL-2, contributing to the survival of malignant B cells. The BCL-2 protein plays a crucial role in regulating apoptosis, and its overexpression is a hallmark of follicular lymphoma.
**Why Each Wrong Option is Incorrect**
**Option A:** The bcr-abl hybrid is associated with chronic myeloid leukemia (CML), not nodular lymphoma. CML is characterized by the t(9;22) translocation, which results in the formation of the BCR-ABL fusion gene.
**Option C:** c-myc activation is associated with Burkitt lymphoma, a different type of non-Hodgkin lymphoma. Burkitt lymphoma is characterized by the t(8;14) translocation, which results in the overexpression of the c-myc oncogene.
**Option D:** t(8;14) is indeed a translocation associated with lymphoma, but it is characteristic of Burkitt lymphoma, not nodular lymphoma.
**Clinical Pearl / High-Yield Fact**
When considering the diagnosis of follicular lymphoma, it is essential to remember that the t(14;18) translocation is a hallmark of this disease. This translocation leads to the overexpression of BCL-2, which contributes to the survival of malignant B cells.
**✓ Correct Answer: B. bcl-2 activation**