What is the fine-grained topic of the following text: Basilea is already conducting two further open-label phase 1/2a clinical studies to explore different dosing regimens of BAL101553 in patients with advanced solid tumors, one study with weekly 48-hour continuous infusion and the other with once-daily oral dosing. Only return the topic.
"Phase 1/2a clinical studies on dosing regimens of BAL101553 in patients with advanced solid tumors"