PECAM1 and myeloid sarcoma: First, the analysis of the pool of all MS patient samples revealed that the mean ± SD of the counts/μl plasma were significantly higher than in healthy controls for the three types of MPs analyzed: 27,203 ± 16,767 for PMPs vs. 15,646 ± 11,901 for controls (p < 0.001) (Figure 1A,B; Figure 3A) 6,527 ± 4,554 EMPs-CD31 vs. 2,202 ± 2,783 for controls (p < 0.001) (Figure 1A,B; Figure 3B), and 746 ± 642 for EMPs-CD62E vs. 418 ± 289 for controls (p < 0.05) (Figure 1D, E; Figure 3C).