Inclusion Criteria: 1. Japanese aged at least 20 years old at a time of enrollment. 2. Histological or cytological confirmation of a solid malignant tumor excluding lymphoma that is refractory to standard therapies or for which no standard therapies exist. 3. ECOG Performance Status 0-1 with no deterioration over the previous 2 weeks and minimum life expectancy of 12 weeks at a time of randomization. 4. At least one lesion (measurable and/or non-measurable) that can be accurately assessed at baseline by CT, MRI or plain X-ray and is suitable for repeated assessment. 5. Adequate bone marrow, hepatic, and renal function 6. Willingness to provide consent for archival biopsy samples if available.