Table 2.

An overview analysis method in ctHPVDNA studies

Study	Detection regions	Analysis method	Control
Cao et al. [17]	HPV L1, HPV 16/18, E6, E7	TaqMan PCR	β-globin
Dahlstrom et al. [27]	HPV16 E6, E7	Real-time PCR	β-actin
Hanna et al. [54]	HPV16,18,31,33,45 E7	Droplet digital PCR	pUC57 plasmid
Hanna et al. [53]	HPV16,18,31,33,45 E7	Multiplexed droplet digital PCR	pUC57 plasmid
Damerla et al. [28]	HPV16, HPV33	Droplet digital PCR	EIF2C1
Chera et al. [22]	HPV16,18,31,33,45 E7	Droplet digital PCR	ESR1
Chera et al. [23]	HPV16 E6, 37; HPV18,31,33,35,37 E7	Digital PCR	ESR1
Reder et al. [121]	HPV16 E6, E7	Real-time quantitative PCR	β-globin
Veyer et al. [158]	HPV16 E6	Droplet digital PCR	Albumin gene
Haring et al. [55]	HPV16 E6	TaqMan probe-based ddPCR	UM-SCC-104, UM-SCC-105
Retting et al. [123]	HPV16, 18, 31, 33, 35	Droplet digital PCR	ESR1