**5. Receptor approaches of drug targeting in cancer**

Receptor based targeting is being focused on ensuring the accurate delivery of carriers to their desired location [25]. It allows targeting not only to a localized tumor but also to traveling cancerous cells. This ensures precise delivery. Due to the excessive expression of receptors, targeting becomes easy. Ligands carry out the functionality through active targeting [26].

#### **Figure 1.**

*Due to the active targeting, the nanoparticles are getting accumulated in the tumor site. Compered to nontargeted nanoparticles, actively targeted nanoparticles reach the tumor site with higher efficiency and through the endocytosis process, the nanocomposite triggers cancer cells death.*

Receptor based targeting is being focused on ensuring the accurate delivery of carriers to their desired location [25]. It allows targeting not only to a localized tumor but also to traveling cancerous cells. This ensures precise delivery. Due to the excessive expression of receptors, targeting becomes easy. Ligands carry out the functionalization through active targeting (this has to be deleted) [27].
