I have some parraffin blocks with cells extracted from gastric cancer patient and healthy patients. So far, I did not find a marker which was exclusively expressed in gastric cancer. Does anybody know if there is such marker ?
I would not be in complete support to the suggestion of Bogdan to try cathepsin B as a marker for gastric cancer. Actually I have myself seen its overexpression in many different cancer types. You should be looking for some markers which is specific for gastric cancer. I would suggest to consult with histopathologists and oncologists regarding this.
I am not sure if my views are correct but I hope they may help you out.