Alteration of sister chromatid exchange frequencies in gastric cancer and chronic atrophic gastritis patients with and without H pylori infection

Table 1 SCE frequency in H pylori-positive and -negative groups of patients and healthy controls (mean ± SE)

		Sex F/M	n	Age, yr	Age at diagnosis, yr	SCE
GC Patients	H pylori-positive	3/6	9	53.77 ± 10.27	53.33 ± 9.26	9.20 ± 0.94
	H pylori-negative	5/10	15	63.20 ± 6.98	63.06 ± 7.06	7.41 ± 1.36
CAG Patients	H pylori-positive	2/7	9	51.33 ± 11.21	50.11 ± 15.16	7.93 ± 0.81
	H pylori-negative	5/12	17	57.23 ± 13.58	56.65 ± 13.65	6.92 ± 1.2
Controls		6/9	15	51.26 ± 6.27		5.54 ± 0.8

GC: Gastric cancer; CAG: Chronic atrophic gastritis.