The damage to oxyntic cells of gastric glands will result in
Pernicious anemia
The damage to oxyntic cells of gastric glands will result in pernicious anemia because oxyntic cells secretes intrinsic factors that are essential for absorption of vitamin B12.
If any kind of damage happens to these cells than vitamin B12 will not be absorbed by the body, which will cause deficiency of B12 and will lead to pernicious anemia.