Why do people get cancer

Science Comics|Why do people get cancer? Shanghai Cell Therapy Engineering Technology Research Center Yesterday The following article came from a long reading, the author of China Science and Technology Press long reading to promote scientific and technological cultural knowledge, spread scientific thoughts, cultivate scientific thinking, advocate scientific methods; serve teachers’ professional development, help students learn; recommend excellent Popular science books, scientific and cultural books and teaching materials; educational information collation and publishing services. The World Health Organization (WHO) International Agency for Research on Cancer (IARC) recently released a report saying that they estimate that the number of people suffering from cancer worldwide is “rapidly increasing.” In 2018 alone, 18.1 million cases were added, and the number of deaths was as high as 960. Million. By the end of the 21st century, cancer will become the world’s number one “killer” and the biggest “blocker” that hinders the extension of human life expectancy. Researchers estimate that 1/5 of men and 1/6 of women worldwide will develop cancer in their lifetime, and 1/8 of men and 1/11 of women will die of cancer. Asia is the hardest hit by cancer, and lung cancer, breast cancer and colorectal cancer are the cancers that suffer the most. Nearly half of the world’s new cancer cases and more than half of cancer deaths come from Asia, which accounts for 60% of the world’s population. It is estimated that by 2030, the number of cancers worldwide will increase to 22.2 million. Picture taken from: Qian Qijun’s “Cancer War” China Science and Technology Press Which cancers are highly fatal? Lung cancer, breast cancer, and colorectal cancer are the most common cancers. Lung cancer caused 1.8 million deaths in 2018, accounting for 18.4% of the total estimated cancer deaths; colorectal cancer ranked second, resulting in 881,000 deaths; stomach cancer and liver cancer caused 783,000 people and 782,000 people, respectively Death, ranked third and fourth; breast cancer ranked fifth, will cause 627,000 deaths. What are the high incidence of cancer in men and women? For men, the five types of cancer that are most common are lung cancer, liver cancer, stomach cancer, colorectal cancer, and esophageal cancer. This is related to the fact that the proportion of men who smoke and drink alcohol is much higher than that of women, so quitting smoking and quitting alcohol are the main steps towards a healthy life. Picture taken from: Qian Qijun’s “Cancer War” by China Science and Technology Press. For women, the five most common cancers are breast cancer, lung cancer, liver cancer, stomach cancer, colorectal cancer and cervical cancer. Especially in developing countries, due to poor hygiene conditions, hygiene awareness and hygiene habits, women have a higher incidence of cervical cancer. Picture taken from: Qian Qijun’s “Cancer Wars” China Science and Technology Press Why do humans get cancer? There are abundant studies on the causes of cancer in the world. In general, it comes down to the following two main reasons: one is that external environmental factors cause cancer, such as smoking, excessive drinking, viral infection, radiation, and toxic substances, etc.; the second is genetic factors, which are genetically inherited cancer susceptibility genes . In fact, one reason for the large increase in the proportion of cancers is that human lifespan has become longer. So how can the external environment cause people to get cancer? This starts with the cells of the human body. Under normal circumstances, the two cells that the cell divides into are exactly the same, but in special cases, there will be mutated cells. Picture taken from: Qian Qijun’s “Cancer War” China Science and Technology Press. These mutated cells are caused by mutations in the ribonucleic acid (DNA) that controls cell division. However, don’t be afraid, these mutated cells will be restricted by the cell’s supervision system and cannot “proliferate” like normal cells, and soon “dead”. Picture taken from: Qian Qijun’s “Cancer Warfare” China Science and Technology Press. However, the two genes P53 and Rb of the supervision system occasionally fail, resulting in a large number of “reproduction” of mutant cells. However, the height of the devil is high and the height is high. At this time, the body’s immune system will play a role to eliminate these mutated cells in time. The human body produces a lot of mutant cells every day, and these mutant cells will be killed by the immune system in time. However, the immune system also has omissions, causing the mutant cells to escape. If the genes mutated in these mutant cells are related to cancer, it will cause cancer in the human body. Picture taken from: Qian Qijun’s “Cancer War” by China Science and Technology Press. In fact, cancer cells can only escape the pursuit of immune cells by constantly mutating before they can eventually cause cancer. Picture taken from: Qian Qijun’s “Cancer Warfare” Chinese Section