Fig. (2) Expression of anti-Ro, anti-CA6, anti-PSP and anti-SPI antibodies were evaluated in 8 patients with SLE and no SS, 9 patients with SLE and secondary SS, 7 patients with SSc and no SS, 7 patients with SSc and secondary SS, 4 patients with MCTD and no SS and 7 patients with MCTD and secondary SS. Data shown are the percentage of patients in each of these groups expressing either IgM, IgG or IgA antibodies to CA6, PSP or SP1 or IgG antibodies to Ro.