Table 2. HRs (95% CI) of sensitivity analysis for HIFs overexpression on OS.

Study omitted	Estimated HR	low value of 95%CI	High value of 95%CI
Korkeila (2011)	3.08576	2.080869	4.575933
Shioya (2011)	2.716886	1.716758	4.299657
Kwon (2010)	3.219644	2.075922	4.993494
Saigusa (2011)	2.852396	1.829702	4.446713
Toiyama (2010)	2.839389	1.815004	4.441936
Rajaganeshan (2009)	2.338718	1.678648	3.258336
Rasheed (2009)	2.684669	1.706306	4.224007
Theodoropoulos (2006)	2.776092	1.734063	4.444295
Shimomura (2013)	3.028906	1.852393	4.95266
Combined	2.8408349	1.8734429	4.3077604