ACKR3 and lung carcinoma: One positive correlation (hsa_circ_0072309 vs. ACKR3) and two negative correlations (hsa_circ_0072309 vs. miR‐100; miR‐100 vs. ACKR3) were observed in the BM samples (Figure 3A–C), primary lung carcinoma foci (Figure 3D–F), and serum samples (Figure 3G–I) of BM+ patients (p < 0.0001).