Table 3.

Anatomic distribution of VTE among all cancer patients

	VTE algorithm 1#	VTE algorithm 2&
	(N = 1,388)	(N = 473)
Sites	Patient no. (%)	Patient no. (%)
Pulmonary embolism	118 (8.5)	76 (16.1)
Pulmonary embolism and venous thrombosis	16 (1.1)	15 (3.2)
Thrombosis of extremities	73 (5.3)	19 (4.0)
Thrombosis of vena cava	38 (2.7)	12 (2.5)
Thrombosis of renal vein, hepatic vein or portal vein	734 (52.9)a	90 (19.0)b
Thrombosis of unspecified site	384 (27.7)	255 (53.9)
Superficial venous thrombosis	4 (0.3)	0 (0.0)
Multiple thrombotic sites	21 (1.5)c	6 (1.3)d

^a715 patients had portal vein thrombosis, 12 patients had hepatic vein thrombosis, 7 patients had thrombosis of renal vein.

^b86 patients had portal vein thrombosis, 2 patients had hepatic vein thrombosis, 2 patients had thrombosis of renal vein.

^c16 patients had concomitant thrombosis of vena cava and intra-abdominal venous, 1 patient had concomitant thrombosis of extremities and other unspecified site, and 3 patients had concomitant thrombosis of vena cava, intra-abdominal venous and other unspecified site.

^d4 patients had concomitant thrombosis of vena cava and intra-abdominal venous, and 2 patients had concomitant thrombosis of intra-abdominal venous and other unspecified site.

^#VTE algorithm 1 was defined as a hospital admission with diagnostic codes of VTE (ICD-9-CM codes 415.1x, 451.xx, 452, and 453.xx).

^&VTE algorithm 2 was based on both the hospital admission with diagnostic codes of VTE and managements of VTE (prescription of intravenous or subcutaneous (IV/SC) anticoagulants (unfractionated heparin (UFH) or low-molecular-weight heparin (LMWH)) or reimbursement codes of surgical thromboectomy) during the hospital stay.