A longer tumor growth delay was reported with [131I]I-GMIB-4AH29 in U87MG xenografts (16) or with [177Lu]Lu-FAP2286 in a sarcoma PDX with high FAP expression on tumor cells (36), further highlighting how the targeted cell plays a crucial role in tracer accumulation, tumor MAD, and ultimately antitumor effect. Here, FAP is linked to sarcoma.