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Determination of how many immunoglobulin variable region heavy chain mutations are allowable in unmutated chronic lymphocytic leukaemia – long‐term follow up of patients with different percentages of mutations
Author(s) -
Hamblin Terry J.,
Davis Zadie A.,
Oscier David G.
Publication year - 2008
Publication title -
british journal of haematology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.907
H-Index - 186
eISSN - 1365-2141
pISSN - 0007-1048
DOI - 10.1111/j.1365-2141.2007.06928.x
Subject(s) - homology (biology) , chronic lymphocytic leukemia , immunoglobulin heavy chain , antibody , heavy chain , genetics , immunoglobulin light chain , biology , medicine , immunology , gene , leukemia
Summary The choice of 98% sequence homology for immunoglobulin heavy chains to distinguish between mutated and unmutated versions of chronic lymphocytic leukaemia (CLL) was arbitrary and was chosen to account for supposed polymorphisms. Some authors chose 97% or even 95%. This study examined survival curves for cohorts of patients with varying degrees of sequence homology. All patients with <97% homology behaved as if mutated. Those with 97–98% homology were more aggressive than the mutated cases, but less aggressive than those with >98% homology.