“…Based on prospectively collected data on 1586 patients with 96 CRT events (6.1%), our study has shown that the insertion site of the catheter, size of the catheter, and indwelling time are significant risk factors for thrombotic occlusion. The risk factors for thrombotic occlusion are various, and organic factors include endothelial damage, stasis of venous flow, and/or an underlying prothrombotic state 12 . Other factors associated with the development of thrombotic occlusion in cancer patients include the type of central venous catheter, insertion in the subclavian vein, left-sided insertion, longer duration of catheter insertion, catheter-to-vein ratio, professional expertise, and optimal routine care 13,14 .…”