Which are the causes of Stomach cancer?

Stomach cancer, or gastric cancer, is primarily caused by complex interactions between chronic infections, environmental exposures, and genetic predispositions that lead to DNA damage in stomach lining cells. While the exact trigger for every individual case remains under investigation, it is rarely the result of a single cause, but rather a cumulative process of cellular changes over many years.

What are the primary causes and risk factors of stomach cancer?

It is crucial to distinguish between a cause—a direct factor that triggers the disease—and a risk factor, which increases the likelihood of developing it. The most significant established cause is chronic infection with the bacterium Helicobacter pylori (H. pylori). This bacterium triggers long-term inflammation (gastritis), which can eventually lead to the cellular mutations seen in stomach cancer.

Are there specific genetic factors linked to stomach cancer?

While most cases of stomach cancer are sporadic (not inherited), about 1% to 3% are linked to hereditary cancer syndromes. These involve germline mutations passed through families. Key genetic considerations include:

• CDH1 gene mutations: Associated with Hereditary Diffuse Gastric Cancer (HDGC).


• Lynch Syndrome: Increases the risk of various gastrointestinal cancers.


• BRCA1/BRCA2 mutations: Often linked to breast and ovarian cancer, these can also slightly elevate the risk of developing stomach cancer.

What environmental triggers contribute to stomach cancer?

Environmental factors significantly influence the development of stomach cancer. High intake of salt-preserved, smoked, or pickled foods and low consumption of fresh fruits and vegetables are well-documented risk factors. Additionally, tobacco use and heavy alcohol consumption are linked to an increased incidence of stomach cancer. Understanding these triggers is a major focus of current oncological research, as many are modifiable.

How is current research improving our understanding of stomach cancer?

Current research is moving toward molecular profiling to better classify stomach cancer subtypes. By studying the tumor microenvironment, researchers aim to understand why some patients respond to immunotherapy while others do not. Scientists are also investigating how the microbiome beyond H. pylori might influence gastric health.

Next steps

• Consult a gastroenterologist or oncologist to discuss your specific risk factors or family history.


• If you have a strong family history, request a referral to a genetic counselor to discuss testing for hereditary syndromes.


• Join our community at DiseaseMaps.org to connect with the 13 members who have shared their experiences with stomach cancer.

Medical disclaimer: This information is for educational purposes only and does not constitute professional medical advice, diagnosis, or treatment.

References

• NIH National Cancer Institute (NCI): Gastric Cancer Risk Factors.


• American Cancer Society: Causes, Risk Factors, and Prevention of Stomach Cancer.


• Orphanet: Rare hereditary gastric cancer syndromes.


• PubMed: Molecular pathophysiology of gastric adenocarcinoma.