FAP and neoplasm: Dosimetry calculations based on autoradiography studies on patient tumor samples showed that even with lower binding, a higher absorbed dose to the tumor can be accomplished with [<sup>161</sup>Tb]Tb-FAP-2286.<h4>Conclusions</h4>In our in vitro and in vivo studies, [<sup>177</sup>Lu]Lu-FAP-2286 and [<sup>161</sup>Tb]Tb-FAP-2286 demonstrated similar behavior.