Table I.

Histological characteristics of patients synovial tissue

CaseAge (yr)/SexFollicularaDiffuseaTotal No. of Follicles (A)bNo. of BCA-1-Positive Follicles (B)bNo. of Follicles with B Cell Accumulation (C)cB/A (%)bB/C (%)c
RA 157 /F++87788100
271 /F+++20191995100
359 /F
463 /F++
553 /F+
629 /F++65583100
749 /F+333100100
RA total
37343492100
OA 178 /F
286 /M
366 /F
474 /F
573 /F+3236767
679 /F
765 /F+
872 /F+2125050
OA total5356060
  • a The synovium of each patient was histologically characterized as having a follicular or diffuse infiltrate by hemotoxylin and eosin staining.

  • b Total number of follicles (A) and BCA-1-positive follicles (B) were counted, and BCA-1 positivity was given as the ratio B/A (%).

  • c Number of follicles with B cell accumulation (C) was counted after staining for CD20, and BCA-1 positivity was given as the ratio B/C (%).