The RD will be defined following a traditional 3+3 design. The dose escalation will continue until the MTD is found, that is until at least two patients among a cohort of three to six patients experience a dose limiting toxicity (DLT) (i.e., >33 % of patients with a DLT). The RD is defined as the dose level just below the MTD level. If the MTD is not found at cohort 5 the RD for this study will be considered equal to the cohort 5 dosage.