Like FN1, THBS1 would appear to be an interesting marker when looking at the survival plot, but simultaneous staining, obtained by immunohistochemical data from The Human Protein Atlas (THPA), indicates that FN1 shows elevated plasma levels in GC patients in the membrane and cytoplasm, which limits its suitability as a theranostic marker according to the criteria proposed in the research. The gene discussed is THBS1; the disease is gastric cancer.