 - Following a dose escalation phase of 9 to 18 patients, initially 21 evaluable patients will be enrolled in the phase II portion of the study. If 0 to 1 of the 21 patients experiences a clinical response, then no further patients will be enrolled. If 2 or more of the first 21 evaluable patients enrolled have a clinical response, then accrual will continue until a total of 41 evaluable patients have been enrolled. The accrual ceiling will be set at 61 patients. Provided that about 1 patient every 6 weeks will be enrolled onto this trial, approximately 4 years may be needed to accrue the maximum number of patients. 