Table 2.

Results of subgroup meta-analysis

Group	No. of studies	HR (95% CI)	Heterogeneity
			I2 (%)	P
OS	7	2.14(1.66–2.75)	41.1	0.117
Ethnicity
Asian	6	2.06(1.59–2.66)	41.4	0.129
Non-Asian	1	4.24(1.451–12.392)	–	–
Other treatment	4	2.43(1.68–3.51)	8.2	0.352
PFS	4	1.7 (1.36–2.25)	39.2	0.117
Ethnicity
Asian	3	1.66(1.28–2.15)	4.7	0.350
Non-Asian	1	4.007(1.48–10.852)	–	–