Study of DS-1123a in Advanced Solid Tumours

Inclusion Criteria: * Advanced solid tumor that is refractory to standard treatment, or for which no standard treatment is available. * Eastern Cooperative Oncology Group performance status (PS) of 0 or 1. Exclusion Criteria: * Have any of the following concomitant disease or had the history of having following disease within 6 months before enrollment: • Cardiac failure (NYHA ≥ ClassIII), myocardial infarction, cerebral infarction, unstable angina, arrhythmia requiring treatment, coronary-artery/peripheral artery bypass surgery, cerebrovascular disease, pulmonary thromboembolism, deep-vein thrombosis or clinically severe thromboembolic event, or clinically severe pulmonary disease (eg, interstitial pneumonia, pulmonary fibrosis, radiation pneumonia, drug induced pneumonia), * Severe or uncontrolled concomitant disease. * Clinically active brain metastases defined as symptomatic or requiring treatment.