On this basis the selected markers are landscaped for prioritization and selection as shown in Figure with a zoomed in view in Figure . Some key biomarkers are highlighted which are already on the market and being used as established markers while several others which could be promising markers are highlighted in Figure . Table in the Supporting Information shows a list of all these markers along with the information on the cancer they are associated with, and the kind of sample used to measure them. From within this list, markers which are measured in specimens collected using non/minimal invasive techniques were further shortlisted. 1992 unique biomarkers were used to build a network graph to put them in context with a total of five gastrointestinal cancers (Figure ). Such an analysis helps understand the specificity of these biomarkers for the disease of choice as well as the potential of a biomarker to work across several indications. The network can be viewed in an interactive way at . Figure . Interaction network of diagnostic and risk biomarkers that can be measured through non-invasive sampling. The biomarkers (magenta nodes) and their links with 5 gastrointestinal cancers are depicted. For an interactive view of this network visit .