Nowadays, more and more people know that cancer itself is not contagious, and it can be transmitted by some related risk factors, such as bacteria, viruses, etc. However, there are still genetic characteristics in the occurrence of cancer, and the genetic characteristics of different cancers are also different.
1. Lung cancer: The risk of cancer in close relatives is nearly 2 times higher
Familial aggregation is a familial component of lung cancer risk. The study found that the risk of developing lung cancer in the first-degree relatives of lung cancer patients was 1.88 times higher than that of the first-degree relatives in the control group.
2. Breast cancer: The risk of cancer in close relatives is 3 times higher
Epidemiological studies have found a three-fold increase in the risk of developing breast cancer in one close relative and a seven-fold increase in the risk of developing breast cancer in two close relatives.
3. Liver cancer: it has obvious familial characteristics
Liver cancer has obvious familial aggregation and genetic predisposition, and its incidence is obviously decreasing in the first and second relatives of patients, but the incidence is higher than that of the general population.
4. Bowel cancer: 30% have familial characteristics
Colorectal cancer, also known as colorectal cancer, in colorectal cancer patients, 10%~30% of patients have familial aggregation characteristics, of which about 6% are hereditary colorectal cancer. The most common hereditary colorectal cancer is Lynch syndrome (hereditary nonpolyposis colorectal cancer). In addition, "familial adenomatous polyps" are inherited in an autosomal dominant manner and have a high probability of developing into malignancy.
5. Gastric cancer: 5%~10% is hereditary
Among all gastric cancer patients, 5%~10% are hereditary gastric cancer. Among them, hereditary diffuse gastric cancer syndrome is the first hereditary gastric cancer to be identified, which occurs at a younger age, has a higher risk in women, and is mostly accompanied by extragastric tumors.
6. Thyroid cancer: 10% of patients have a family history
Among all thyroid cancers, papillary thyroid cancer is the most common, accounting for more than 75% of all thyroid cancer patients. About 10% of people with papillary thyroid cancer have a family history.
Author: Liu Yan
Source: Shenyang Center for Disease Control and Prevention
Editor: Bai Bing, Sun Kaifeng
Proofreading: Qiu Wei, Chen Zeming
Preliminary review: Sun Baijun
Review: Xu Jiang