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A new discovery could explain why obese people are more likely to develop cancer, scientists say.
Obesity is the biggest preventable cause of cancer in the UK after smoking, Cancer Research UK says.
Dr Leo Carlin, from the Cancer Research UK Beatson Institute, said: "Although we know that obesity increases the risk of 13 different types of cancer, we still don't fully understand the mechanisms underlying the link.
"This study reveals how fat molecules prevent immune cells from properly positioning their tumour-killing machinery, and provides new avenues to investigate treatments."
