The invention provides methods of treating or preventing in a subject a cancer, tumor, or neoplasm, including malignancies or metastases thereof, using a direct Factor Xa inhibitor. The methods particularly involve the treatment of human patients afflicted with a malignant cancer, tumor, or neoplasm with an effective amount of the Factor Xa inhibitor. In an embodiment, the Factor Xa inhibitor is the small molecule edoxaban p-toluenesulfonate monohydrate, also termed “DU-176b”. The invention provides methods of administering a Factor Xa inhibitor to effectively reduce or suppress, or otherwise abrogate, the growth of cancers, tumors, or neoplasms in a subject who has, or is at risk for, cancer and, optionally, who also has, or is at risk for, thrombotic disease or embolism. The methods of the invention can also reduce the incidence of migration or invasion of metastatic or malignant cancers in a human subject by administration of a Factor Xa inhibitor.
