What other risk factors might make it more likely for a cancer patient to clot?

Having surgery to remove the cancer, particularly abdominal and pelvic surgery increases risk. Being hospitalized, immobile, or having a central venous catheter placed (for chemotherapy or other reasons) also increases risk. Risk goes up as age increases, and having a family history of DVT/PE or a pre-existing inherited or acquired thrombophilia makes it more likely for a cancer patient to clot.