Table 6.

Summary of differentially expressed circRNAs investigated in biliary tract cancers.

Author	Year	Cancer Type	circRNA	Expression in Tumour Tissue	Ass Association with Features of Malignancy Evaluated
Xu Y et al. [98]	2018	CCA	hsa_circ_0001649	Down	In vitro, in vivo and clinical data
Jiang X et al. [96]	2018	CCA	ciRS-7 (Cdr1as)	Up	Clinical data
Kai D et al. [26]	2018	GBC	hsa_circ_0000284 (or circHIPK3)	Up	In vitro
Xu Y et al. [97]	2019	CCA	circ_0005230	Up	In vitro, in vivo and clinical data
Wang et al. [53]	2019	GBC	hsa_circ_0008234 (or circFOXP1)	Up	In vitro, in vivo and clinical data
Lu Q and Fang T [103]	2019	CCA	circSMARCA5	Down	In vitro and clinical data
Huang X et al. [33]	2019	GBC	circERBB2	Up	In vitro, in vivo and clinical data
Wang S et al. [100]	2019	CCA	hsa_circ_0000284	Up	In vitro and in vivo
Li D et al. [99]	2020	CCA	ciRS-7 (Cdr1as)	Up	In vitro and in vivo
Xu Y et al. [101]	2020	CCA	hsa_circ_102064 (or circ-CCAC1)	Up	In vitro, in vivo and clinical data