Table 3.

Second primary malignancies in gastric cancer.

Reference	Number of patients	Number of SPM	Odd’s ratio (95% CI)
Hiyama et al. (14)	61,168	1045	M: 0.84 (0.78–0.90)
			F: 0.90 (0.79–1.01)
Lundegardh et al. (15)	34,506	962	1.16 (1.09–1.24)
Ikeda et al. (16)	2250	47	N/A
Bozzetti et al. (13)	105	10	N/A
Ikeda et al. (17)	1070	54	N/A
Current study	33,720	2019	1.11 (1.06–1.16)

N/A, not available; SPM, second primary malignancies; M, male; F, female; CI, confidence interval.