In all arms, treatment continues in the absence of disease progression or unacceptable toxicity. During the treatment period, patients will have study visits on Day 1 of every cycle (every 4 weeks from start of study drug) and will receive CT/MRI assessment every 2 cycles (every 8 weeks). In the event of radiological progression confined to the liver, e.g. appearance of new nodules in the liver in areas previously not treated by locoregional therapies, patients will then also be treated with locoregional therapies such as TACE or local ablation as long as the they may still benefit from treatment. If patients are no longer amenable to locoregional therapies (in the case of untreatable progression), the study will be stopped and best supportive care be offered. This will be based on the investigator's clinical judgment of the subject's status.