How To Prevent Lung Cancer After Quitting Smoking – Image: The lungs of ex-smokers contain up to four times more genetically healthy cells than those of current smokers. see more
Protective cells in the lungs of ex-smokers may explain why quitting smoking reduces the risk of developing lung cancer, Cancer Research UK-funded researchers have found.
How To Prevent Lung Cancer After Quitting Smoking
Scientists from the Wellcome Sanger Institute and UCL have found that compared to current smokers, people who quit smoking have more genetically healthy lung cells that have a much lower risk of developing cancer.
Lung Cancer: Quitting Smoking Regrows Protective Lung Cells
Today (Wednesday)*, is part of the £20 million (US$26 million) Mutographs of Cancer project, a Cancer Research UK Grand Challenge initiative**. The project is discovering DNA “signatures” that indicate the source of the damage, to better understand the causes of cancer and discover those we may not yet be aware of.
The study shows that quitting smoking can do much more than just stop further lung damage. Researchers believe it may also allow new, healthy cells to actively replenish the lining of our airways. This change in the ratio of healthy to damaged cells can help protect against cancer.
Lung cancer is the most common cause of cancer death in the UK, accounting for 21% of all cancer deaths***. Tobacco smoking damages DNA and greatly increases the risk of lung cancer, with around 72 per cent of the 47,000 annual lung cancer cases in the UK being caused by -smoking.**** In the United States, it is estimated that around 229,000 cases of lung cancer will be diagnosed in 2020.*****
Damage to the DNA in the cells lining the lungs creates genetic errors, and some of these are “driver mutations,” which are changes that give the cell a growth advantage. Eventually, the accumulation of these driver mutations can allow cells to divide uncontrollably and become cancerous. However, when someone stops smoking, they avoid much of the subsequent risk of lung cancer******.
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In the first major study of the genetic effects of smoking on “normal” non-cancerous lung cells, researchers analyzed lung biopsies****** from 16 people, including current smokers, never smokers and children. .
They sequenced the DNA of 632 individual cells from these biopsies and looked at the pattern of genetic changes in these non-cancerous lung cells.
The researchers found that although they are not cancerous, more than 9 out of 10 lung cells in current smokers have up to 10,000 additional genetic changes – mutations – compared to non-smokers, and these mutations are directly caused by the chemicals in tobacco. smoke More than a quarter of these damaged cells have at least one cancer driver mutation, which explains why the risk of lung cancer is much higher in people who smoke.
Unexpectedly, in people who had stopped smoking, there was a significant group of cells lining the airways that had escaped genetic damage from their previous smoking. Genetically, these cells were equal to those from people who had never smoked: they had much less genetic damage from smoking and had a low risk of developing cancer.
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The researchers found that smokers had four times more of these healthy cells than people who still smoked—accounting for up to 40 percent of smokers’ total lung cells.
Joint senior author Dr Peter Campbell of the Wellcome Sanger Institute said: ‘People who have been heavy smokers for 30, 40 years or more often tell me it’s too late to stop smoking – the damage has already been done. What’s so exciting about our study is that it shows it’s never too late to quit – some of the people in our study had smoked more than 15,000 packs of cigarettes in their lifetime, but within a few years of quitting many of the cells that line their airways show no evidence of harm from tobacco.”
Dr Kate Gowers, joint first author from UCL, said: “Our study is the first time scientists have looked in detail at the genetic effects of smoking on individual healthy lung cells. We found that even these healthy lung cells from smokers contained thousands of genetic mutations. They can be seen as mini time bombs waiting for the next hit that will cause them to progress to cancer… More studies with larger numbers of people are needed to understand how cancer develops from these damaged lung cells .”
Although the study showed that these healthy lung cells can begin to repair the lining of the airways in ex-smokers and protect them from lung cancer, smoking also causes deeper damage to the lungs, which can lead to emphysema – chronic lung disease. This damage is not reversible, even after you stop smoking.
The Quit Smoking Timeline And What Happens To The Body
Professor Sam Janes, joint senior author from UCL and University College London Hospitals Trust, said: “Our study has an important public health message and shows that it really pays to stop smoking to reduce your risk of” lung cancer. Quitting smoking at any age is good. not only does it reduce the accumulation of more damage, but it can revive cells undamaged by past lifestyle choices. Further investigation of this process may help to understand how these cells protect against cancer and may potentially lead to new avenues for research into anti-cancer therapeutics.”
Dr Rachel Orritt, Health Information Manager at Cancer Research UK, said: “It’s a really motivating idea that people who quit smoking can reap the benefits twice – by preventing further tobacco-related lung damage cells and by giving your lungs a chance. to balance out some of the existing damage with healthier cells. What is needed now are larger studies looking at cell changes in the same people over time to confirm these findings.
“The results add to the existing evidence that if you smoke, quitting completely is the best thing you can do for your health. It’s not always easy to kick a bad habit, but getting support from a free stop smoking service and a local person roughly triples the chance of success compared to going it alone.”
Disclaimer: AAAS and ! is not responsible for the accuracy of news published on ! by contributing institutions or for using any information through the system. The day was founded to raise awareness of lung cancer issues and highlight the urgent need for more funding for lung cancer research, destigmatization of the disease and escalating other conversations related to the fight against lung cancer. disease.
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As the world celebrates World Lung Cancer Day today, this special edition focuses exclusively on the situation surrounding the disease, how to know if you are at risk or not, and how to take care of yourself.
GLOBOCAN estimates that 2,094,000 new cases of lung cancer were diagnosed worldwide in 2018, making lung cancer the leading cancer worldwide. More than 80% of those affected are at risk of death from it.
Lung cancer is the second most common cancer in men after prostate cancer and is the second most common cancer in women after breast cancer.
Africa, being a developing continent, feels the burden of such diseases very badly considering that medical developments to combat the disease are still ongoing.
Must Do’s To Quit Smoking Tobacco
There may be several risk factors that cause lung cancer, depending on the environment, habits, gender and other aspects.
Tobacco smokers are 15 to 30 times more likely to develop lung cancer than nonsmokers. At every stage, quitting smoking reduces the risks of lung cancer and other addiction-related cancers.
It can be tested and controlled by increasing the rate of air circulation in the building and by using specialized underground ventilation systems to prevent gas from entering the building through any cracks and voids.
Usually, the disease does not show visible symptoms in its early stages, but they can be noticed as it progresses. In any case, different people experience symptoms in different ways, with some related to the lungs and others coming from and around other affected areas.
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By knowing what causes lung cancer, you can make an informed decision about your lifestyle.
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