Can a pack of cigarettes for two days cause nasopharyngeal cancer after smoking for half a year 10

Smoking is only one of the causes of nasopharyngeal cancer, it is best not to smoke if you are afraid of cancer, and those with a family history should pay more attention to it.

Smoking is one of the main culprits of cancer, but half of the people who smoke for half a year will get cancer is relatively small, but in the long run, there will be a possibility of cancer, so it is better to quit smoking.

There are many reasons for the occurrence of nasopharyngeal cancer, of course, smoking can lead to nasopharyngeal cancer and lung cancer, so it is better to reduce smoking or quit smoking.

What are the factors that cause nasopharyngeal cancer?

The formation of nasopharyngeal carcinoma is mainly influenced by the following three factors: genetic factors, infection by Epstein-Barr virus, and certain environmental factors. Among them, genetic factors are the most important, and people from southern China have a high rate of nasopharyngeal cancer.

Siblings and close relatives of NPC patients also have a much higher risk of developing NPC. Many studies have confirmed that Epstein-Barr virus infection is one of the important causes of nasopharyngeal carcinoma.

What are the factors that cause nasopharyngeal cancer? Studies have shown that an individual's lifestyle and eating habits are significantly related to the development of nasopharyngeal cancer. Patients with nasopharyngeal carcinoma due to EB

Viruses, on the contrary, have an immune effect on some other viruses. Not everyone will be affected by the Epstein-Barr virus, and only those who have inherited the gene have a high chance of developing nasopharyngeal cancer.

The hair of nasopharyngeal carcinoma is multifaceted. Years of clinical observation and experimental studies have shown that the following factors are closely related to the occurrence of nasopharyngeal carcinoma.

1.Genetic factors.

1) Familial agglomeration Many patients with nasopharyngeal carcinoma have a family history of cancer. Nasopharyngeal carcinoma tends to occur in both vertical and horizontal families.

2) Racial susceptibility Nasopharyngeal carcinoma is mainly seen in yellow people and less common in white people; Ethnic groups with a high incidence of disease who have emigrated elsewhere (or resettled abroad) still have a high incidence of disease among their descendants.

3) Regional concentration Nasopharyngeal carcinoma mainly occurs in the five southern provinces of China, namely Guangdong, Guangxi, Hunan, Fujian and Jiangxi, accounting for the first place in the local head and neck malignant tumors. Southeast Asian countries are also high-risk areas.

4) Susceptibility genes In recent years, molecular genetic studies have found that the chromosomal changes in nasopharyngeal carcinoma tumor cells are mainly chromosome 17, and the discovery of multichromosomal heterozygous deletion regions (1p, 9p, 9q, 11q, 13q, 14q and 16q) in nasopharyngeal carcinoma tumor cells may indicate the existence of multiple tumor tumor suppressor gene mutations in the development of nasopharyngeal carcinoma.

2.Viral infections.

In 1964, Epstein and Barr first established a passaging-ready lymphoblastic cell line from biopsy tissue from African childhood lymphoma (Burkitt lymphoma). Herpetic virus particles can be seen on electron microscopy. Because it has different properties from other members of the herpesvirus family, it is named Epstein-Barr virus, or Epstein-Barr virus.

Virus-laden lymphoblastoid cell lines can be isolated from nasopharyngeal carcinoma tissues, and a few virus particles can be seen under electron microscopy. Immunological and biochemical studies have confirmed that EBV is closely related to nasopharyngeal carcinoma. The dynamic change and monitoring of EBV antibody titers can be used as indicators for clinical diagnosis, prognosis estimation and follow-up monitoring.

In addition to Epstein-Barr virus, other viruses, such as coronavirus, are also thought to be involved in the occurrence and development of nasopharyngeal carcinoma.

3.Environmental factors.

There are reports that the mortality rate of nasopharyngeal cancer in Chinese who have emigrated abroad gradually decreases with the number of generations inherited. On the other hand, Caucasians born in Southeast Asia have an increased risk of nasopharyngeal cancer. These suggest that environmental factors may play an important role in the pathogenesis of nasopharyngeal carcinoma.

Epidemiological investigation found that babies in areas with a high incidence of nasopharyngeal carcinoma in Guangdong Province had salted fish in their first food contact after weaning. In addition, dried fish and Guangdong cured meat are also associated with the incidence of nasopharyngeal cancer. These foods contain nitrosamine precursor nitrite during the curing process.

When the pH of human gastric juice is 1 3, nitrosamine compounds can be synthesized with secondary amines in cells with nitrite (which needs to be reduced to nitrite by cells). These substances have a strong carcinogenic effect.

Excessive levels of certain trace elements, such as nickel, in the environment may also induce nasopharyngeal cancer.