Amplification of IGH/CCND1 fusion gene in a primary plasma cell leukemia case

The IGH/CCND1 fusion gene has been reported in many hematologic tumors such as mantle cell lymphoma, chronic lymphocytic leukemia, prolymphocytic leukemia, multiple myeloma, and plasma cell leukemia. We report a case of plasma cell leukemia showing five IGH/CCND1 fusion signals by interphase fluorescence in situ hybridization (FISH). Conventional cytogenetic analysis and multicolor spectral karyotyping showed a complex karyotype that did not include t(11;14). Metaphase FISH studies revealed three IGH/CCND1 fusion signals, two of which were amplified signals. These findings indicate that IGH/CCND1 fusion gene was amplified and interspersed in several chromosomes. The patient was treated with intensive chemotherapy. However, the clinical course was very aggressive. The amplification of the IGH/CCND1 fusion gene may contribute to the aggressive course of the disease. To our knowledge, this is the first case showing amplification of the IGH/CCND1 gene in plasma cell neoplasms.