However, the cell viability for the mixed system—Ac-Cys-Ahx-Lys-BBN/Ac-Cys-Ahx-Lys-RAF@AuNPs—was comparable to Ac-Cys-Ahx-Lys-RAF@AuNPs, and a notable drop in cell viability was observed (53% and 59%, respectively, in reference to untreated samples) for GRPR-positive cancer cells. This evidence concerns the gene GRPR and cancer.