Fig. 1

In vivo distribution of iodine-125 (I-125)–labeled cetuximab after perispinal injection using single-photon emission computed tomography (SPECT). a Biodistribution of I-125–labeled cetuximab suggested the injection to be intrathecal instead of perispinal. b The biodistribution displayed is in line with images of the other four animals that received perispinal injections. The radiolabeled drug in these animals was found only at the injection site