Table 7: Viral vectors and Enzymes used for VDEPT system.

S.No.	Viral vectors	Enzymes	Examples
1.	Adenovirus	Thymidine kinase	Ganciclovir
		Human carboxylesterase	Iirinotecan
		Nitroreductase	CB 1954
2.	Retrovirus	Nitroreductase	CB 1954
		Cytosine deaminase	5-FC
		Human CYP and P450 reductase	Cyclophosphamide
3.	EBV	Nitroreductase	CB 1954