The US Department of Health and Human Services recently released the 15th edition of its Carcinogens report, which includes eight new carcinogens. These include helicobacter pylori chronic infection as a definite carcinogen, antimony trioxide as a reasonably suspected carcinogen, and 6 kinds of byproducts of haloacetic acid after disinfection of tap water are considered to have teratogenic and carcinogenic side effects.
Helicobacter pylori, in particular, is extremely common in daily life. Helicobacter pylori (HP) is the most common chronic bacterial infection in humans, accounting for more than 50% of natural bacterial infections worldwide, according to an investigation of the Association between HP Infection rates and Different environmental Factors. The rate of infection is higher in developing countries than in developed countries. According to the national H. pylori survey from 2001 to 2014, the infection rate of H. pylori in China is between 40% and 90%, with an average of 59%.
The development of gastric cancer has a certain process, among which helicobacter pylori infection is a key factor leading to gastric cancer. Chronic infection caused by Helicobacter pylori is classified as a clear human carcinogen in the 15th Carcinogenic report issued by the Us Department of Health and Human Services (HHS).
In addition, in recent years, a series of studies have shown that Helicobacter pylori infection can significantly increase the risk of gastric cancer, and various mechanisms of helicobacter pylori inducing gastric cancer have been found.
In fact, in 2017, the International Agency for Research on Cancer (IARC) under the World Health Organization (WHO) published a list of four carcinogens based on their association with cancer, which is considered the most comprehensive list of carcinogens so far. Combing through the list, we can find: Category 1 is a confirmed carcinogen for humans; Type 2 has limited evidence of carcinogenicity in humans; Three are suspected to be carcinogenic to humans; Category 4 is a substance that may not be carcinogenic to humans.
There are 120 category 1 carcinogens, including alcohol, salty fish, air pollution, solar radiation and smoking, which are closely related to daily life. But it is important to emphasize that exposure to these substances does not necessarily cause cancer, but represents a higher risk. But there is also evidence that long-term exposure to Group 1 carcinogens can increase the risk of cancer.