**4. Hydrolysable cationic polymers as non-viral gene delivery vectors**

This section reviews hydrolysable cationic polymers as non-viral gene delivery vectors. In the past decade, hydrolysable cationic polymers (Figure 3) have been studied as non-viral gene delivery vectors since they display lower toxicity as compared to their non-degradable counterparts. These research works accelerate the availability of safe and efficient non-viral gene delivery vectors.
