Five Serum Trace Elements Associated with Risk of Cardia and Noncardia Gastric Cancer in a Matched Case-Control Study.

BACKGROUND

Serum trace elements have for some time been suggested to influence the development of gastric cancer, but evidence is still lacking.

METHODS

All newly diagnosed patients with gastric cancer were compared with healthy controls 1:1 matched by sex, age (±3 years), and place of residence during 2013-2015. The serum concentration of all trace elements was analyzed using inductively coupled plasma mass spectrometry. infections in cases were diagnosed using the rapid urease test, while in controls were detected using the colloidal gold method.

RESULTS

A total of 122 cases of gastric cardia cancer (GCC) and 177 gastric noncardia cancer (NCGC), and 299 matched healthy controls were included. Positive associations were found between serum copper and copper/zinc ratio and risk of overall gastric cancer (OR: 2.42, 95% CI: 1.10-5.32 for copper; OR: 11.7, 95% CI: 3.83-35.6 for copper/zinc ratio), and for both GCC and NCGC subtypes. Serum selenium was inversely associated with the risk of NCGC (OR: 0.18, 95% CI: 0.07-0.51), while molybdenum seems to reduce the risk of GCC (OR: 0.12, 95% CI: 0.03-0.47). Strong inverse associations were also detected between serum calcium and risk of all groups of gastric cancer (all for trend<0.05).

CONCLUSION

The current study indicated statistically significant positive associations between serum copper, copper/zinc ratio, and gastric cancer, as well as inverse associations among selenium, molybdenum, and calcium. The results shall be carefully interpreted before further in vivo animal studies show definitive evidence.