Advanced PC patients with UGT1A1-DV who had received at least one cycle of FOLFIRINOX...response rate (RR) and progression-free survival (PFS) in patients given irinotecan of ≤ 120 mg/m2 were 21.4% and 8.1 months, respectively....we recommend that in Japanese advanced PC patients with UGT1A1- DV treated with FOLFIRINOX, irinotecan be administered at an initial dose of ≤ 120 mg/m2.