Smoking Exposure and Survival of Patients with Esophagus Cancer: A Systematic Review and Meta-Analysis

Table 2

Other important characteristics of included studies.

Comparison	Study	Median survival (month)	1-year survival rate	3-year survival rate	5-year survival rate	ESCC HR, 95% CI for OS	EA HR, 95% CI for OS
Current versus never smokers	Zhang et al. [10]	NR	NR	NR	NR	1.605 (0.736–3.497)	NR
	Lin et al. [13]	NR	NR	54% versus 67%	46% versus 64%	1.494 (1.157–1.928)	NR
	Mirinezhad et al. [15]	14.47 versus 13.83	61% versus 56%	21% versus 28%	21% versus 21%	1.34 (1.08–1.69)	NR
	Thrift et al. [16]	NR	66% versus 76%	NR	22% versus 48%	1.42 (0.89–2.28)	NR
	Sundelöf et al. [17]	NR	NR	NR	NR	1.4 (0.7–2.8)	1.0 (0.6–1.7)
Former versus never smokers	Thrift et al. [16]	NR	63% versus 76%	NR	28% versus 48%	1.15 (0.74–1.79)	NR
	Sundelöf et al. [17]	NR	NR	NR	NR	2.1 (1.0–4.4)	0.9 (0.6–1.4)
Ever versus never smokers	Trivers et al. [11]	NR	NR	NR	NR	0.99 (0.62–1.59)	0.86 (0.64–1.16)
	Wu et al. [14]	10 versus 12	NR	NR	NR	1.08 ( 0.82–1.43)	NR

Used to smoke, but now quit smoking; including current and former smokers; NR: not reported.