In the second series in Step 5, participants will receive an additional 10 doses of VOR 400 mg PO every 72 hours and 3 HXTC infusions. The first HXTC infusion in Step 5 (HXTC #3) will occur 6 hours after the 11th dose of VOR (1st dose in Step 5), the 2nd HXTC infusion (HXTC #4) will occur 6 hours after the 16th dose of VOR, and the 3rd HXTC infusion (HXTC #5) will occur 1 - 3 days after the 20th dose of VOR. If there are insufficient cells manufactured to allow 5 infusions, the first infusion in Step 5 (HXTC #3) will be omitted.