Table:
Author	Year	Country	Type	Method	Reference	Case number (high/low)	Survival analysis	Analysis type	Follow-up months	HR availability	Quality score
Ma et al. [40]	2017	China	GC	RT-PCR	GAPDH	98	OS	Kaplan–Meier	60	Indirectly	7
Du et al. [22]	2017	China	PCa	RT-PCR	GAPDH	62	OS	Kaplan–Meier	36	Indirectly	6
Xiao et al. [45]	2017	Ukraine	CRC	RT-PCR	GAPDH	70	OS	Multivariate	100	Indirectly	6
Wu et al. [16]	2017	China	ESCC	RT-PCR	GAPDH	64/63	OS	Multivariate	100	Indirectly	8
Chen et al. [17]	2017	China	CRC	RT-PCR	GAPDH	58/57	OS	Kaplan–Meier	150	Indirectly	8
Wei et al. [21]	2017	China	PC	RT-PCR	GAPDH/RNU6B	32/32	OS	Multivariate	30	Indirectly	6
Du et al. [38]	2017	China	Glioma	RT-PCR	GAPDH	35/34	OS	Multivariate	36	Indirectly	6
Hu et al. [23]	2017	China	BC	RT-PCR	GAPDH	32/20	OS	Kaplan–Meier	50	Indirectly	6
Kobayashi et al. [20]	2016	Japan	CSCC	RT-PCR	GAPDH	24/25	OS	Multivariate	160	Indirectly	6
Chen et al. [19]	2016	China	GC	RT-PCR	GAPDH	54/52	OS	Kaplan–Meier	120	Indirectly	8
Song et al. [14]	2016	China	NPC	RT-PCR	GAPDH	76/32	OS	Kaplan–Meier	120	Indirectly	8

Parse the following content of the table in markdown code: | Author | Year | Country | Type | Method | Reference | Case number (high/low) | Survival analysis | Analysis type | Follow-up months | HR availability | Quality score | 
 | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | 
 | Ma et al. [40] | 2017 | China | GC | RT-PCR | GAPDH | 98 | OS | Kaplan–Meier | 60 | Indirectly | 7 | 
 | Du et al. [22] | 2017 | China | PCa | RT-PCR | GAPDH | 62 | OS | Kaplan–Meier | 36 | Indirectly | 6 | 
 | Xiao et al. [45] | 2017 | Ukraine | CRC | RT-PCR | GAPDH | 70 | OS | Multivariate | 100 | Indirectly | 6 | 
 | Wu et al. [16] | 2017 | China | ESCC | RT-PCR | GAPDH | 64/63 | OS | Multivariate | 100 | Indirectly | 8 | 
 | Chen et al. [17] | 2017 | China | CRC | RT-PCR

| GAPDH | 58/57 | OS | Kaplan–Meier | 150 | Indirectly | 8 | 
 | Wei et al. [21] | 2017 | China | PC | RT-PCR | GAPDH/RNU6B | 32/32 | OS | Multivariate | 30 | Indirectly | 6 | 
 | Du et al. [38] | 2017 | China | Glioma | RT-PCR | GAPDH | 35/34 | OS | Multivariate | 36 | Indirectly | 6 | 
 | Hu et al. [23] | 2017 | China | BC | RT-PCR | GAPDH | 32/20 | OS | Kaplan–Meier | 50 | Indirectly | 6 | 
 | Kobayashi et al. [20] | 2016 | Japan | CSCC | RT-PCR | GAPDH | 24/25 | OS | Multivariate | 160 | Indirectly | 6 | 
 | Chen et al. [19] | 2016 | China | GC | RT-PCR | GAPDH | 54/52 | OS | Kaplan–Meier | 120 | Indirectly | 8 | 
 | Song et al. [14] | 2016 | China | NPC | RT-PCR | GAPDH | 76/32 | OS | Kaplan–Meier | 120 | Indirectly | 8 |