To assess whether the HLA-DR4 association found in rheumatoid arthritis (RA) is also seen in the large granular lymphocyte (LGL) syndrome.
HLA-DR genotyping was performed using restriction fragment length polymorphism and polymerase chain reaction analysis.
LGL syndrome patients with RA showed the same HLA-DR4 association seen in RA/Felty's syndrome (FS), while LGL syndrome patients without arthritis did not.
It is proposed that FS and the LGL syndrome represent different variants of a broader syndrome comprising RA, neutropenia, LGL expansions, HLA-DR4 positivity, and splenomegaly.