CD93 and chronic myelogenous leukemia, BCR-ABL1 positive: Next, we assessed CD93 protein expression on the LSC population isolated from CP-CML PB samples (n = 22), and CP-CML BM (n = 9) compared with normal samples (n = 7) using FACS analysis and confirmed the significant upregulation of CD93 protein on CML LSCs compared with normal HSCs (p < 0.0001), where CD93 expression was absent/very low (Fig. 2c).