- The study will be conducted using a phase II optimal design where initially 21 evaluable patients will be enrolled into each of two cohorts. If none of the 21 patients per cohort experiences a complete clinical response, then no further patients will be enrolled but if 1 or more of the first 21 evaluable patients enrolled in that cohort have a complete clinical response, then accrual to that cohort will continue until a total of 41 evaluable patients have been enrolled in that cohort.