Doses were to be escalated to a maximum of 700 µg or de-escalated to a minimum of 260 µg according to the prescribed algorithm outlined in the study protocol and based on the number of patients experiencing a DLT within each dose cohort. Safety data was to be reviewed by the medical monitor, the site investigators who had enrolled patients at that dose, and Viventia Biotech Inc. (the sponsor) to determine if escalation or de-escalation was to occur. All Stage I patients, including those in the original RD cohort, were to remain in Stage I and continue treatment beyond their initial four weeks at their original dose assignment. If dose de-escalation was deemed necessary, all Investigators with patients receiving higher doses would have been notified and given the option of either administering a de-escalated dose or discontinuing treatment.