The Application segmentation categorizes the FAPI for Tumor Diagnosis market into three functional uses: diagnostic imaging, therapeutic intervention, and companion diagnostics. Diagnostic imaging, which includes PET, SPECT, and hybrid modalities, remains the largest application, representing about 55 % of market revenue due to its established clinical workflow and reimbursement pathways. Therapeutic intervention, primarily radio‑immunotherapy and targeted drug delivery, captures roughly 30 % of the market, reflecting growing clinical evidence of FAPI‑mediated tumor ablation and the higher price points of therapeutic agents. Companion diagnostics—tests that pair FAPI imaging results with personalized treatment decisions—contribute the remaining 15 % and are expanding as precision oncology matures. These application segments collectively shape the overall market size: imaging supplies the volume base, therapy adds high‑margin growth, and companion diagnostics create ancillary revenue streams. The distribution underscores the strategic importance of the FAPI for Tumor Diagnosis segmentation for stakeholders planning product portfolios.