Table 3.

Frequency of autoantibodies.

	SSc/PBC Overlap, n = 16 (%)	SSc Alone, n = 801 (%)	All Subjects, n = 817 (%)
AMA by IIF	7 (44)	9 (1)	16 (2)
AMA by MIT3	13 (81)	43 (5)	56 (7)
ELISA
sp100	5 (31)	21 (3)	26 (3)
gp210	1 (6)	2 (0.3)	3 (0.4)
ANA	14 (88)	721 (90)	735 (90)
CENP-B	16 (100)	230 (29)	246 (30)
ATA	1 (6)	155 (19)	156 (19)
Anti-RNAP	0	145 (18)	145 (18)

AMA: antimitochondrial antibodies; IIF: indirect immunofluorescence; CENP-B: anticentromere B antibodies; ATA: antitopoisomerase I antibodies; Anti-RNAP: antiRNA-polymerase III antibodies; ANA: antinuclear antibodies.