- Current requirement for anti-coagulation therapy that prolongs PT or aPTT 7. History of prior malignancy except: Curatively treated non-melanoma skin cancer; Solid tumor treated curatively >5 years previously without evidence of recurrence; or History of other malignancy that in the Investigator's opinion would not affect the determination of study treatment effect (e.g., superficial bladder cancer, or carcinoma in situ of the prostate, cervix, or breast);