IKZF1 and hematocrit: Compared with non-SS patients, the expression of PTPRC, CD69, and LCP2 protein in the salivary gland of SS with HT group was significantly different from that of non-SS group, but there was no significant difference between SS without HT group and non-SS group; The expression of IKZF1 protein in SS without HT group was significantly higher than that in non-SS group, but there was no significant difference between SS with HT group and non-SS group (Fig. 6).