**3. Conclusion**

The development of newer drug delivery systems based on the use of quantum dots is one of the advantages for various disease treatments, such as cancer and gene therapy, as noted above. This modality allows for site-specific drug therapies and a higher safety profile. However, the pharmaceutical industry is far from knowing everything about the toxicological profile of all nanomaterials. However, nanotechnological challenges are evolving and it is necessary to focus our attention on the standardization of parameters for the evaluation of the cytotoxicity of nanomaterials such as quantum dots in order to broaden their safety range and thus ensure lower toxic effects. In the meantime, let us not forget that the key to the toxicity caused by quantum dots is given by the interaction of the elements that compose them and the biomolecules of the biological system. In the very near future, we can include scientific bases that tell us about physicochemical perspectives of quantum dots, better experimental conditions already standardized and reliable comparative analyses (*in vitro* and *in vivo*).

### **Appendices and nomenclature**


Cd cadmium

*Toxicity of Quantum Dots DOI: http://dx.doi.org/10.5772/intechopen.112073*

