Comparison 2. Sensitivity analysis for allocation concealment.

Outcome or subgroup title	No. of studies	No. of participants	Statistical method	Effect size
1 Overall survival	3		Hazard Ratio (95% CI)	Subtotals only
1.1 Adequate allocation concealment	2	265	Hazard Ratio (95% CI)	0.92 [0.63, 1.34]
1.2 Unclear allocation concealment	1	199	Hazard Ratio (95% CI)	0.97 [0.67, 1.41]
2 Disease control	4		Hazard Ratio (95% CI)	Subtotals only
2.1 Adequate allocation concealment	2	476	Hazard Ratio (95% CI)	0.70 [0.52, 0.95]
2.2 Unclear allocation concealment	2	283	Hazard Ratio (95% CI)	0.58 [0.41, 0.81]