Laboratory findings
Up to week 156 of the maintenance phase, mean serum gastrin, pepsinogen I and II, and serum chromogranin A levels were consistently higher in the vonoprazan group than the lansoprazole group (Figs. Serum gastrin levels at the start of the healing phase and during the maintenance phase up to week 156. Pepsinogen I levels at the start of the healing phase and during the maintenance phase up to week 156. Pepsinogen II levels at the start of the healing phase and during the maintenance phase up to week 156. Serum chromogranin A levels at the start of the healing phase and during the maintenance phase up to week 156. Pepsinogen I/II ratio at the start of the healing phase and during the maintenance phase up to week 156. 