Table 3. Main results of the pooled analysis.

Survival	Variables	No. of studies	Rondom-effects model or fixed-effects model			Heterogeneity
			No. of patients	Pooled HR	95%CI	I2	P
OS	All	19	2009	0.59	0.39-0.90	85.20%	0.000
	Type
	genital system tumors	4	301	0.42	0.27-0.66	0.00%	0.431
	digestive system	6	723	0.65	0.29-1.47	80.40%	0.000
	respiratory system	3	250	0.60	0.23-1.62	92.60%	0.000
	urinary system	3	314	0.54	0.04-4.74	93.90%	0.000
	others	3	421	0.74	0.23-2.37	80.9%	0.005
	Sample
	>100	10	1325	0.44	0.30-0.64	67.70%	0.001
	<100	9	684	0.83	0.41-1.70	84.40%	0.000
	Country
	China	16	1752	0.55	0.35-0.86	85.80%	0.000
	Other countries	3	257	0.98	0.19-5.10	87.20%	0.000
	Method
	Univariate	10	1069	0.56	0.38-0.82	52.40%	0.032
	Multivariate	9	940	0.57	0.28-1.17	89.80%	0.000