How weather increases the risk of cancer

Living in a cold climate could make people more likely to get cancer, people are at greater risk in colder countries because of their genes. The same genes which stop human cells from dying in freezing temperatures are also linked to breast and bowel cancer and leukaemia. A researcher says the genes contributing to cooler climates are the same which increase the risk of malignant tumours forming in the body.

Genetic variants found to be beneficial in extreme environments, can also predispose for cancer. Cell resistance at low temperatures and at high altitude probably increases the probability for malignancy.’Previous research from 2010 found grim weather in northern parts of the world may make men more vulnerable to prostate cancer, perhaps due to a lack of vitamin D from the sun.

However the new study - which compared international rates of cancer with 240 genetic studies of cancer and seven others in cold and high-altitude countries - suggests where people live affects their genes.Extreme cold weather can cause human cells to die, so that people in freezing countries have genetic mutations to prevent cell death and repair DNA.
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Time zones may increase your risk of cancer

A new study suggests the effects of time zones can contribute to development of some cancers that are linked to change in biological clock.

Researchers examined data of 4 million adults from more than 600 countries who had been diagnosed with cancer between 2000 and 2012

They discovered that every 5 degree of longitude toward the west that a person lived from the eastern edge of their time zone increased risk of developing cancer.

Researchers said men who lived in the western-most region of a time zone had risk of developing prostate cancer, compared with men that lived in eastern-most regions of time zone.

They found that women living in the western-most region had risk of developing breast cancer compared to women living in eastern-most regions of time zone.

Normally, living things are supposed to be exposed to sun during the day and darkness at night but people stay indoor during the day and exposed to light at night, this can reduce melatonin at night, alter immune system and raise risk of developing cancer.