 Part 1 will commence with an accelerated dose escalation design for the first 4 cohorts. The study will then follow a 33 design from Cohort 5 onwards in order to provide adequate PK profile data. In Part 1 the MTD is defined as the highest dose at which no more than 1 in up to 6 patients experience a DLT during Cycle 1. The dose escalation rules to be followed during Part 1 of the study are described in the study protocol. 