XCHT for Irinotecan-Induced Gut Toxicities (Run-in Study)

"XCHT 9g, po qd, 3 days before each cycle of chemotherapy for 5 days, except the 1st cycle of chemotherapy for irinotecan used cohort patients.~Additional XCHT, 9g qd will be orally administrated for 4 days during the Round 0 study for irinotecan naive cohort patients."

Raloxifene 60mg po, used as probe for pharmacokinetic testing. For irinotecan naive cohort patients, raloxifene 60mg will be orally administrated on Day 1 and Day 5 (4th day of XCHT administration) during round 0 study, Day 3 (the day before chemotherapy) during round 2 and round 3 study. For irinotecan used cohort patients, raloxifene 60mg will be orally administrated on Day 1 (irinotecan using day) during round 1 study, Day 4 (irinotecan using day) during round 2 study, and Day 3 (the day before chemotherapy) during round 3 study.

Patients will receive 3 cycles of FOLFIRI regimen for chemotherapy. Irinotecan intravenous (IV) infusion (180 mg/m2) through a drip into the bloodstream over 90 minutes. Folinic acid (400 mg/m2) IV infusion through a drip into the bloodstream over 2 hours. 5-fluorouracil (5-FU) IV bolus (400 mg/m2) into the bloodstream over 5 minutes, followed by 5-FU (2400 mg/m2) continuous IV infusion through a drip or pump into the bloodstream for 46-48 hours.