Recently, the group of Ulański reported radiation‐induced (e.g., γ‐rays or electron beam) synthesis of internally crosslinked polyacrylic acid (PPA) nanogels bearing carboxylic acid groups for functionalization with DOTA‐labeled bombesin molecules.[225] The bombesin peptide addresses the gastrin‐releasing peptide receptor (GRPR) overexpressed on many tumors such as breast, pancreas or prostate cancer. This evidence concerns the gene GRP and prostate cancer.