Cancer is one of the most feared diseases in the world. Many people wonder whether it is mostly caused by bad luck, aging, or things we can actually control.
A new study from Yale University offers a clearer answer to this question and helps people better understand what causes cancer to develop.
The research was led by Professor Jeffrey Townsend and published in the scientific journal Molecular Biology and Evolution. In this study, scientists looked closely at how cancer forms by studying changes in DNA.
DNA carries the instructions that control how our cells grow and function. When these instructions are damaged or changed, cells can grow in an uncontrolled way, which leads to cancer.
The team focused on genetic changes, also known as mutations, found in 24 different types of cancer. These mutations can act like clues. They show whether the cancer was likely caused by outside factors, such as sunlight or smoking, or by internal processes, such as aging.
By studying these patterns, the researchers were able to estimate how much different causes contribute to cancer. This is important because it helps answer a key question: how much of cancer can be prevented?
Some cancers were found to be strongly linked to preventable causes. For example, skin cancer, especially melanoma, is often caused by too much exposure to ultraviolet light from the sun or tanning beds.
In the same way, lung cancer is closely linked to smoking. These types of cancer are considered highly preventable because their main causes are related to human behavior.
The study found that a large proportion of these cancers could be avoided if people reduced harmful exposures. This means wearing sunscreen, avoiding tanning beds, and not smoking could make a big difference in lowering cancer risk.
The researchers also found that bladder cancer and some skin cancers are strongly influenced by preventable factors. This suggests that public health measures and personal habits can play a powerful role in reducing the number of cases.
However, not all cancers are as easy to prevent. The study showed that some cancers are more strongly linked to natural processes inside the body.
For example, prostate cancer and gliomas, a type of brain cancer, are more closely related to aging. As people get older, cells naturally go through many divisions, and small mistakes can happen in DNA. Over time, these mistakes can build up and lead to cancer.
This means that even if a person lives a very healthy lifestyle, some cancer risk cannot be completely avoided. This can help explain why cancer still occurs in people who do everything “right.”
One of the most important findings of the study is that it provides a way to measure how much each factor contributes to cancer. Instead of just saying that smoking or sunlight increases risk, the researchers could estimate how much these factors are responsible for the disease.
This approach can also help identify hidden risks in certain groups of people. For example, if a group has a high rate of a specific cancer, scientists can look at the mutation patterns to see if there is exposure to harmful substances in their environment or workplace.
Even though the study provides valuable insights, the researchers note that it does not explain everything. Some complex genetic changes, such as large changes in chromosomes, were not fully included in this research. More studies are needed to understand these details.
Overall, this study gives a clearer picture of how cancer develops. It shows that while some cancers are strongly influenced by lifestyle and environment, others are more related to natural aging processes.
For individuals, this means that making healthy choices still matters. Reducing exposure to known risks can lower the chance of developing certain cancers. At the same time, it is important to understand that not all risk can be controlled.
As science continues to advance, studies like this can help people make better decisions about their health and support efforts to prevent cancer on a larger scale.
If you care about cancer, please read studies that low-carb diet could increase overall cancer risk, and new way to increase the longevity of cancer survivors.
For more health information, please see recent studies about how to fight cancer with these anti-cancer superfoods, and results showing daily vitamin D3 supplementation may reduce cancer death risk.
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