FAP and neoplasm: Considering that our previous data showed tumor uptake and retention of 68Ga-FAPI-RGD to be significantly greater than those of 68Ga-FAPI-46 and 68Ga-c(RGDfK) in mouse xenografts (10), we speculated that 68Ga-FAPI-RGD would be a promising radiotracer for imaging tumors expressing either FAP or integrin αvβ3.