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.
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.
Hamblin
Terry J
TJ
Department of Haematology, Royal Bournemouth Hospital, Bournemouth, UK. terjoha@aol.com
Davis
Zadie A
ZA
Oscier
David G
DG
D001483:Base Sequence; D004252:DNA Mutational Analysis; D015326:Gene Rearrangement, B-Lymphocyte, Heavy Chain; D050438:Genes, Immunoglobulin Heavy Chain; D005819:Genetic Markers; D006801:Humans; D007135:Immunoglobulin Variable Region / Q000235:genetics*; D015451:Leukemia, Lymphocytic, Chronic, B-Cell / Q000235:genetics* / Q000276:immunology* / Q000401:mortality; D008969:Molecular Sequence Data; D011379:Prognosis; D012189:Retrospective Studies; D016415:Sequence Alignment; D017385:Sequence Homology; D015996:Survival Rate
D005819:Genetic Markers; D007135:Immunoglobulin Variable Region