Therefore, following cancer diagnosis, patients with a vWF:Ag level greater than 2.35 IU/mL and an ADAMTS-13 level less than 1.03 IU/mL have a high probability of developing DVT during chemotherapy, suggesting that both vWF:Ag and ADAMTS-13 have a mechanistic effect. This evidence concerns the gene ADAMTS13 and deep vein thrombosis.