RT Journal Article SR Electronic T1 Two cases of antinuclear antibody negative lupus showing increased proportion of B cells lacking RP105. JF The Journal of Rheumatology JO J Rheumatol FD The Journal of Rheumatology SP 562 OP 564 VO 32 IS 3 A1 Syuichi Koarada A1 Masaru Ide A1 Yoshio Haruta A1 Yoshifumi Tada A1 Osamu Ushiyama A1 Fumitaka Morito A1 Akihide Ohta A1 Kohei Nagasawa YR 2005 UL http://www.jrheum.org/content/32/3/562.abstract AB B cells lacking RP105 molecule, a member of the Toll-like receptor family, were increased in the peripheral blood of 2 patients with antinuclear antibody (ANA) negative systemic lupus erythematosus (SLE). The increased proportion of RP105-lacking B cells was associated with disease activity in patients with ANA-negative SLE. When there are no significant serological markers for SLE, analysis of expression of RP105 may be helpful in evaluation of activity in ANA-negative SLE. We describe a new approach, using phenotyping of B cells, to evaluate activity of ANA-negative SLE.