Fig. 3

Literature Data Evaluation in Gastrointestinal Malignancies. Pie chart percentages represent the number of included patients with each cancer type in the evaluated studies. The highest number of patients in the studies belongs to gastric cancer, while the lowest number belongs to esophageal cancer. The gray colour-code tables in each cancer type illustrate the possible FAPI PET indication, based on the interpretation of the available literature data. The darkest gray indicates highly promising literature data in this indication. The lighter gray indicates there is promising data in this indication, however there are also some contradictory reports (e.g. low specificity). The lightest gray suggests encouraging data in this indication but further exploration is still needed. The white colour indicates that there is not enough data for interpretation. The corresponding reference articles are provided in the tables