Prognostic role of pretreatment serum ferritin concentration in lung cancer patients: A meta-analysis

Table 2 Results of meta-analysis

	No. of studies	HR	95%CI	P value	I2 (%)	Pheterogeneity
Overall survival	12 (17-28)	1.09	1.03-1.15	0.004	86.5	< 0.001
Country
Non-China	5 (17-20, 23)	1.61	1.27-2.03	< 0.001	0.0	0.760
China	7 (21, 22, 24-28)	1.06	1.00-1.12	0.042	91.5	< 0.001
Tumor type
SCLC	4 (17, 19, 22, 27)	1.99	0.74-5.35	0.175	90.7	< 0.001
LC	4 (18, 20, 21, 28)	1.39	1.09-1.77	0.008	0.0	0.666
NSCLC	5 (19, 23-26)	1.03	0.98-1.07	0.281	86.2	< 0.001

HR: Hazard ratio; CI: Confidence interval; SCLC: Small cell lung cancer; LC: Lung cancer; NSCLC: Non-small cell lung cancer.