Can stomach cancer be contagious to others?

Gastric cancer is a common malignant tumor. Sometimes it occurs frequently in families. Some people wonder if gastric cancer is contagious. So, is gastric cancer really contagious? Gastric cancer is not contagious, but Helicobacter pylori, one of the causes of gastric cancer, is contagious.

Helicobacter pylori (HP) is an important factor in the development of many chronic gastric diseases. HP is closely related to chronic gastritis, peptic ulcer, and gastric cancer. Almost half of the population is infected for life, and the infection sites are mainly in the stomach and duodenal bulb.
Helicobacter pylori is acquired and its mode of transmission is not yet clear, but the most likely route is oral-oral and fecal-oral transmission. Helicobacter pylori infection has a clear clustering phenomenon within the family. If one person in the family has stomach problems, their family members and children may also develop stomach problems in the future. If parents are infected with Helicobacter pylori, their children are much more likely to be infected than other families.
Because Helicobacter pylori is one of the causes of gastric cancer, families with a large number of Helicobacter pylori patients will have a high incidence of gastric cancer, which gives people the false impression that gastric cancer is contagious. In fact, it is Helicobacter pylori that can be transmitted.