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Humans' culture, oncogenic?

ANI | Updated: May 22, 2018 18:24 IST

Washington D.C. [U.S.A.], May 22 (ANI): Turns out, the destruction caused by humans is not just limited to our race. It has been found that humans are causing cancer in wild animals.
According to a study conducted by the Arizona State University, humans are changing the environment in a way that causes cancer in wild animal populations.
As humans, we know that some of our activities can cause cancer to develop in our bodies. Smoking, poor diets, pollution, chemicals used as additives in food and personal hygiene products, and even too much sun are some of the things that contribute to an increased risk of cancer.
The study was conducted by Mathieu Giraudeau and Tuul Sepp.
"We know that some viruses can cause cancer in humans by changing the environment that they live in -- in their case, human cells -- to make it more suitable for themselves," said Sepp. "Basically, we are doing the same thing. We are changing the environment to be more suitable for ourselves, while these changes are having a negative impact on many species on many different levels, including the probability of developing cancer."
In the paper, Giraudeau and Sepp and a team of international researchers pointed out many pathways and previous scientific studies that show where human activities are already taking a toll on animals.
These include chemical and physical pollution in our oceans and waterways, accidental release of radiation into the atmosphere from nuclear plants, and the accumulation of microplastics in both land- and water-based environments.
In addition, exposure to pesticides and herbicides on farmlands, artificial light pollution, loss of genetic diversity, and animals eating human food are known to cause health problems.
"Cancer in wild populations is a completely ignored topic and we wanted to stimulate research on this question," shared Giraudeau. "We recently published several theoretical papers on this topic, but this time, we wanted to highlight the fact that our species can strongly influence the prevalence of cancer in many other species of our planet.
"Cancer has been found in all species where scientists have looked for it and human activities are known to strongly influence cancer rate in humans. So, this human impact on wild environments might strongly influence the prevalence of cancer in wild populations with additional consequences on ecosystem functioning," he said.
Even something such as artificial light and light pollution, as well as food meant for humans, are negatively affecting wild animals.
Sepp said, "It is already known in human studies that obesity and nutrient deficiency can cause cancer, but these issues have been mostly overlooked in wild animals. At the same time, more and more wild species are in contact with anthropogenic food sources. In humans, it's also known that light at night can cause hormonal changes and lead to cancer. Wild animals living close to cities and roads face the same problem -- there is no darkness anymore. For example, in birds, their hormones -- the same that are linked to cancer in humans -- are affected by light at night. So, the next step would be to study if it also affects their probability of developing tumors."
The study appears in the journal Nature Ecology & Evolution. (ANI)