FAPI-04 PET/CT outperformed FDG in detecting recurrent breast cancer after surgery in a head-to-head comparison, according to results published in the European Journal of Nuclear Medicine. The study tested a radioactive tracer engineered to highlight fibrous tumor stroma rather than tumor glucose metabolism. By focusing on the cancer-associated fibrous scaffolding, FAPI-based imaging aims to improve sensitivity in settings where metabolic imaging can be confounded by inflammation or post-treatment changes. The direct comparison against FDG is particularly relevant for radiology and oncology workflows evaluating surveillance or diagnostic follow-up. If reproduced in broader cohorts, the finding supports a potential shift toward more mechanism-aligned tracers for recurrence detection—especially when clinicians need clarity after initial surgery.