P4HB and neoplasm: Here, using flow cytometry and epifluorescence analysis, we have found that gastric tumor cells express moderate to high levels of heat shock proteins (Hsp40, Hsp60, Hsp70, Hsp90, Hsc70), integrins (β1, β2, and β3), and protein disulfide isomerase (PDI and ERp57) on their surface, while all the proteins evaluated were expressed at low levels in adjacent non-tumor tissue.