Plasma levels of sVCAM-1 and their correlation with total absolute numbers of CD34⁺ cells in the PB of patients with IM. (A) The levels of sVCAM-1 in the plasma of healthy subjects (n = 10) and patients with PV (n = 8) or IM (n = 19) were assayed by ELISA. Each point represents the mean concentration of sVCAM-1 in each individual plasma sample assayed in duplicate. The bar represents the mean of each sample group. The levels of sVCAM-1 in the plasma of both patients with PV (P < .05) and patients with IM (P < .01) were significantly greater than that of normal control plasma. In addition, the levels of sVCAM-1 in the plasma of patients with IM were significantly greater than that from patients with PV (P < .05). (B) Correlation between total absolute numbers of PB CD34⁺ cells and plasma levels of sVCAM-1 in patients with IM. The absolute numbers of CD34⁺ cells in the PB were correlated with the levels of sVCAM-1 in the plasma of patients with IM (n = 12), using the least-squares method.