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Cytogenetic fluorescence in situ hybridization (FISH) panels are a major prognostic tool in chronic lymphocytic leukemia/small lymphocytic lymphoma (CLL/SLL), but few data exist on using paraffin-embedded extramedullary tissue biopsy specimens for these purposes. Isolated whole nuclei were extracted from 20 paraffin-embedded tissue biopsy specimens with CLL/SLL and analyzed using a standard CLL FISH panel. FISH studies were successful in 18 (90%) of 20 cases, and chromosomal abnormalities were detected in 18 (100%) of the technically successful cases. Deletion 13q14.3 was most frequent (10 [56%]; isolated in 8 and with other abnormalities in 2), followed by trisomy 12 (5 [28%]), deletion 11q22.3 (4/16 [25%]), 14q32 (IGH@) translocation (3 [17%]), and deletion 17p13.1 (1/16 [6%]). One case with IGH@ translocation showed a BCL2 translocation partner. No cases showed 6q23 deletion. Results of this FISH panel performed on 42 additional peripheral blood (PB)/bone marrow (BM) CLL specimens were similar except for a significantly greater frequency of deletion 13q14.3 in combination with other aberrations. Cytogenetic FISH studies using paraffin-embedded tissue biopsy specimens in CLL/SLL had a high yield and, with 1 exception, demonstrated a profile similar to cases diagnosed in PB/BM.

american journal of clinical pathology

Cytogenetic Abnormalities Detected by Fluorescence In Situ Hybridization on Paraffin-Embedded Chronic Lymphocytic Leukemia/Small Lymphocytic Lymphoma Lymphoid Tissue Biopsy Specimens