Lack of sunlight may increase the risk of lung cancer, a study suggests.
Researchers found lung cancer rates were highest in countries furthest from the equator, where exposure to sunlight is lowest. It is thought vitamin D - generated by exposure to sunlight - can halt tumour growth by promoting the factors responsible for cell death in the body.
The University of California, San Diego study appears in the Journal of Epidemiology and Community Health.
Experts warn that exposure to sunlight is still the major cause of skin cancer - a disease which is on the increase around the world.
Lung cancer kills more than one million people every year around the globe.
The researchers examined data from 111 countries across several continents
Source - BBC