2. Vitali C, Bombardieri S, Jonsson R, Moutsopoulos HM, Alexander
It is notable that exceptionally high frequencies of CD27
+EL, Carsons SE, Daniels TE, Fox PC, Fox RI, Kassan SS, Pillemer
SR, Talal N, Weisman MH: European Study Group on Classifi-
(including CD27
high) B cells were seen in two patients
cation Criteria for Sjưgren’s Syndrome. Assessment of the
with pSS and secondary NHL, in contrast with all other
European classification criteria for Sjưgren’s syndrome in a
series of clinically defined cases: results of a prospective
patients with pSS (Fig. 1). Although in both cases these
multicentre study. The European Study Group on Diagnostic
lymphomas were putatively derived from later stages of B
Criteria for Sjưgren’s Syndrome. Ann Rheum Dis 1996, 55:
cell differentiation (immunocytoma and plasmocytoid lym-
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