Results of mass endoscopic examination for gastric cancer in Kamigoto Hospital, Nagasaki Prefecture

Table 1 Composition of gastric cancer cases discovered on screening

	X-ray (n = 4261)	Endoscope (n = 7178)
Gastric cancer detection	2	28
Early-stage	1/2	25/28 (89.3%)
Invasion depth (m)	1/2	20/28 (71.4%)
Indication for EMR1	0/2	12/28 (42.9%)
Gastric cancer recurrence	1	0
Gastric cancer death	1	1

¹Indication for EMR (endoscopic mucosal resection) conformed to the March 2001 Gastric Cancer Treatment Guidelines of the Japanese Gastric Cancer Association.

Table 2 Gastric cancer standard mortality ratios (SMR) Mean 95% Cl

	Male		Female
1990-1996	1.041	(0.50-1.58)	1.541	(0.71-2.38)
1997-2006	0.712	(0.33-1.10)	0.622	(0.19-1.05)

¹1990-1996: Town of Kamigoto population (1995), gastric cancer mortality in Nagasaki Prefecture (1995).

²1997-2006: Town of Kamigoto population (2000), gastric cancer mortality in Nagasaki Prefecture (2000). Since all cases of gastric cancer death in 1996 were detected in fiscal year 1995, they were included in the first period.

Table 3 Comparison of discovery costs for 1 gastric cancer case

	X-ray	Endoscope
Total number (a)	4261	7178
Cost (b)	¥3000	¥11 000
No. gastric cancers (n)	2	28
Gross cost (a × b)	¥12 783 000	¥78 958 000
Cost to detect one case of gastric cancer (a × b/n)	¥6 391 500	¥2 819 928