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The delayed occlusion of the proximal inferior vena cava (DOPI) technique: (A). The distal end of the inferior vena cava (IVC) and the left renal vein were fully exposed, and blocking bands were placed 2 cm away from tumor thrombus and twined round vessels two circles; (B). The IVC was incised longitudinally at the entrance of the right renal vein into the IVC; (C). A bulldog clamp was put at the proximal end of the IVC
