piRNA	Expression		Cancer	Function	Reference
	UP	Down
piR−34736		*	Breast	Induced by cell cycle progression	[37]
piR−36249		*	Breast	Induced by cell cycle progression	[37]
piR−35407		*	Breast	Induced by cell cycle progression	[37]
piR−36318		*	Breast	Induced by cell cycle progression	[37]
piR−34377		*	Breast	Induced by cell cycle progression	[37]
piR−36743	*		Breast	Induced by cell cycle progression	[37]
piR−36026	*		Breast	Induced by cell cycle progression	[37]
piR−31106	*		Breast	Induced by cell cycle progression	[37]
piRABC		*	Bladder	Increase the expression of TNFSF4 protein	[38]
PiR−823		*	Gastric	Inhibit cancer cell growth	[39]
piR−55490		*	Lung	Suppress the activation of Akt/mTOR pathway by binding 3/UTR of mTOR messenger RNA and induce its degradation	[40]
piR-L−163		*	Lung	Bind directly to phosphorylated ERM protein ) p-ERM)	[41]
piR-Hep1	*		Liver	deep sequencing of cell lines, validated in matched tumor-normal tissues via PCR	[42]
piR−015551		*	Colorectal	Associated with recurrence-free survival	[43]