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 22 February 2018

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Risk of gastric cancer in patients hospitalized for peptic ulcer

June's issue of The American Journal of Gastroenterology investigates the risk of gastric cancer in operated and un-operated patients with gastric or duodenal ulcers

News image

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Dr Shahram Bahmanyar and colleagues from Sweden and Iran investigated whether the elevated risk of gastric cancer among patients with gastric ulcer (GU) and the enigmatic low risk among patients with duodenal ulcer (DU) apply to both cardia and noncardia gastric cancers.

They also studied the risks among operated patients while taking the disparate baseline risks into consideration.

Retrospective cohorts of 59,550 and 79,412 unoperated patients with DU and GU, respectively, plus 12,840 patients with partial gastric resection and 8,105 with vagotomy, recorded in the Swedish Inpatient Register since 1970, were followed from the first hospitalization (date of operation for the surgery cohort) until occurrence of any cancer, death, emigration, definitive surgery, or December 31, 2003.

Unoperated GU patients had doubled risks for both cancers
The American Journal of Gastroenterology

Standardized incidence ratios (SIRs) with 95% confidence intervals (CIs) expressed relative risk (RR), compared to the age-, sex-, and calendar period-matched Swedish population.

Cox regression produced adjusted RR estimates among operated patients, relative to unoperated ones with the same ulcer type.

While unoperated DU patients had a halved risk of noncardia cancer (SIR = 0.5, 95% CI 0.4-0.7), their risk of cardia cancer was slightly above expectation (SIR = 1.2, 95% CI 0.8-1.7).

Unoperated GU patients had doubled risks for both cancers (SIR = 2.1, 95% CI 2.0-2.4 and SIR = 1.9, 95% CI 1.4-2.3, respectively).

DU patients who underwent gastric resection had a 60% risk elevation (RR = 1.6, 95% CI 1.0-2.5) compared to unoperated ones.

Vagotomy was associated with a greater risk in the first 10 years, but this excess disappeared with further follow-up.

Resected GU patients had a 40% risk reduction relative to their unoperated peers (RR = 0.6, 95% CI 0.5-0.8) and this reduction persisted well beyond the first postoperative decade.

Dr Bahmanyar concluded that, "The DU-related protection against gastric cancer does not seem to pertain to cardia cancer, and with gastric resection, risks are shifted toward normality, regardless of underlying ulcer type".

The American Journal of Gastroenterology 2007; 102 (6), 1185-1191
11 June 2007

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