- Patients receive trabectedin as a 24-hour continuous infusion repeated every 21 days. The first three children entering the study receive a dose of 1.1 mg/m2. Subsequent groups of up to six patients receive higher doses (1.5 mg/m2 and 1.7 mg/m2) as long as the preceding dose is well tolerated. Patients enrolled at the lowest dose level may have their dose increased to the next level if they tolerated the lower dose well. Treatment may continue as long as the cancer does not worsen and the treatment is tolerated.