International normalized ratio of prothrombin time (INR) and prothrombin time (PT) must be =< . x ULN for the lab within days before randomization; patients who are therapeutically treated with an agent such as warfarin may participate if they are on a stable dose and no underlying abnormality in coagulation parameters exists per medical history Within weeks prior to study registration: \r\nInternational normalized ratio (INR)/ partial thromboplastin time (PTT) =< . x ULN within weeks prior to study registration; subjects who are prophylactically treated with an agent such as warfarin or heparin will be allowed to participate provided that no prior evidence of underlying abnormality in coagulation parameters exists ; close monitoring of at least weekly evaluations will be performed until INR/PTT is stable based on a measurement that is pre-dose as defined by the local standard of care International normalized ratio (INR)/ partial thromboplastin time (PTT) =< . x ULN; (subjects who are prophylactically treated with an agent such as warfarin or heparin will be allowed to participate provided that no prior evidence of underlying abnormality in coagulation parameters exists; close monitoring of at least weekly evaluations will be performed until INR/PTT is stable based on a measurement that is pre-dose as defined by the local standard of care International normalized ratio (INR)/partial thromboplastin time (PTT) =< . x ULN; (subjects who are prophylactically treated with an agent such as warfarin or heparin will be allowed to participate provided that no prior evidence of underlying abnormality in coagulation parameters exists) REGORAFENIB INCLUSION CRITERIA: International normalized ratio (INR) and partial thromboplastin time (PTT) =< . x ULN (patients who are prophylactically treated with an agent such as warfarin or heparin will be allowed to participate, provided that no prior evidence of underlying abnormality in coagulation parameters exists; close monitoring of at least weekly evaluations will be performed until INR/PTT is stable based on a measurement that is predose as defined by the local standard of care) Patients receiving anti-coagulation treatment with an agent such as warfarin or heparin may be allowed to participate; for patients on warfarin, the international normalized ratio (INR) should be measured prior to initiation of sorafenib and monitored at least weekly, or as defined by the local standard of care, until INR is stable Patients who are being therapeutically anticoagulated with an agent such as Coumadin or heparin will be allowed to participate provided that no prior evidence of underlying abnormality in these parameters exists International normalized ratio (INR)/ partial thromboplastin time (PTT) < . x ULN; (subjects who are treated with an agent such as warfarin or heparin will be allowed to participate provided that no prior evidence of underlying abnormality in coagulation parameters exists; close monitoring [day of cycle and day of each cycle] is mandatory) will be performed until INR/PTT is stable based on a measurement that is pre-dose as defined by the local standard of care) International normalized ratio of prothrombin time (INR) within days before randomization must be =< ULN for the lab; patients who are therapeutically treated with an agent such as warfarin may participate if they are on a stable dose and no underlying abnormality in coagulation parameters exists per medical history International normalized ratio (INR)/partial thromboplastin time (PTT) =< . x ULN; (patients who are therapeutically treated with an agent such as warfarin or heparin will be allowed to participate provided that no prior evidence of underlying abnormality in coagulation parameters exists; close monitoring of at least weekly evaluations will be performed until INR/PTT is stable based on a measurement that is pre-dose as defined by the local standard of care) International normalized ratio of prothrombin time must be less than or equal to . times the ULN. Patients who are therapeutically treated with an agent such as warfarin or heparin will be allowed to participate if no underlying abnormality in coagulation parameters exists per medical history. International normalized ratio (INR)/ Partial thromboplastin time (PTT) ? . x ULN. (Subjects who are prophylactically treated with an agent such as warfarin or heparin will be allowed to participate provided that no prior evidence of underlying abnormality in coagulation parameters exists. Close monitoring of at least weekly evaluations will be performed until INR/PTT is stable based on a measurement that is pre-dose as defined by the local standard of care. International normalized ratio (INR) < or equal to .; patients receiving anti-coagulation treatment with an agent such as warfarin or heparin MAY be allowed to participate; for patients on warfarin, the INR should be measured prior to initiation of sorafenib and monitored weekly, or as defined by the local standard of care, until INR is stable International normalized ratio (INR)/partial thromboplastin time (PTT) . x ULN; (subjects who are therapeutically treated with an agent such as warfarin or heparin will be allowed to participate provided that no prior evidence of underlying abnormality in coagulation parameters exists; close monitoring of at least weekly evaluations will be performed until INR/PTT is stable based on a measurement that is pre-dose as defined by the local standard of care) International normalized ratio (INR)/partial thromboplastin time (PTT) =< . x ULN (obtained =< days prior to randomization)\r\n* NOTE: patients who are therapeutically treated with an agent such as warfarin or heparin will be allowed to participate provided that no prior evidence of underlying abnormality in coagulation parameters exists; close monitoring of at least weekly evaluations will be performed until INR/PTT is stable based on a measurement that is pre-dose as defined by the local standard of care International normalized ratio (INR)/partial thromboplastin time (PTT) =< . x ULN; Note-subjects who are therapeutically treated with an agent such as warfarin or heparin will be allowed to participate provided that their medication dose and INR/PTT are stable; close monitoring (day of each cycle) is mandatory; if either of these values is above the therapeutic range, the doses should be modified and the assessments should be repeated weekly until they are stable International normalized ratio (INR)/partial thromboplastin time (PTT) =< . x ULN; subjects who are therapeutically treated with an agent such as warfarin or heparin will be allowed to participate provided that no prior evidence of underlying abnormality in coagulation parameters exists; close monitoring of at least weekly evaluations will be performed until INR/PTT is stable based on a measurement that is pre-dose as defined by the local standard of care International normalized ratio (INR) < . or a prothrombin time (PT)/partial thromboplastin time (PTT) within normal limits; patients receiving anti-coagulation treatment with an agent such as warfarin or heparin may be allowed to participate; for patients on warfarin, the INR should be measured prior to initiation of sorafenib and monitored at least weekly, or as defined by the local standard of care, until INR is stable International normalized ratio (INR)/partial thromboplastin time (PTT) =< . x ULN\r\n* Patients who are therapeutically treated with an agent such as warfarin or heparin will be allowed to participate provided that no prior evidence of underlying abnormality in coagulation parameters exists; close monitoring of at least weekly evaluations will be performed until INR/PTT is stable based on a measurement that is pre-dose as defined by the local standard of care International normalize ratio (INR) and the partial thromboplastin time (PTT) < . x ULN. (Subjects who are therapeutically treated with an agent such as warfarin or heparin will be allowed to participate provided that no prior evidence of an underlying abnormality in coagulation parameters exists) Prothrombin time (PT-INR)/ partial thromboplastin time (PTT) ? . x ULN. Subjects who are therapeutically treated with an agent such as warfarin or heparin will be allowed to participate provided that no prior evidence of underlying abnormality in coagulation parameters exists. Close monitoring of at least weekly evaluations will be performed until INR is stable based on a measurement that is pre dose as defined by the local standard of care International normalized ratio (INR)/partial thromboplastin time (PTT) =< . x ULN (subjects who are therapeutically treated with an agent such as warfarin or heparin will be allowed to participate provided that no prior evidence of underlying abnormality in coagulation parameters exists; close monitoring of at least weekly evaluations will be performed until INR/PTT is stable based on a measurement that is pre-dose as defined by the local standard of care) International normalized ratio (INR)/partial thromboplastin time (PTT) =< . x ULN; subjects who are prophylactically treated with an agent such as warfarin or heparin will be allowed to participate provided that no prior evidence of underlying abnormality in coagulation parameters exists; close monitoring of at least weekly evaluations will be performed until INR/PTT is stable based on a measurement that is defined by the local standard of care International normalized ratio of prothrombin time and activated partial thromboplastic time