Table 1, Fig. 1b), in which we analyzed sera, revealing again the highest expression of CXCL4 in SSc (449,563 ± 332,000 pg ml−1, range: 0–1.8x106 pg ml–1, N = 88), as compared with HD (114,354 ± 171,987 pg ml−1, range: 0–696,050 pg ml−1, N = 60, P < 0.0001) and SLE (127,940 ± 259,133 pg ml−1, range: 0–1.4x106 pg ml−1, N = 85, P < 0.0001) (Fig. 1b). Here, PF4 is linked to systemic lupus erythematosus.