label: Small Lymphocytic Lymphoma with Unmutated Immunoglobulin Heavy Chain Variable-Region Gene
label_lc: small lymphocytic lymphoma with unmutated immunoglobulin heavy chain variable-region gene
description: "Small lymphocytic lymphoma characterized by the absence of somatic hypermutation within the immunoglobulin heavy chain gene variable region of neoplastic clones. Patients have a significantly worse prognosis as compared to those with mutated immunoglobulin heavy chain gene variable region rearrangements."