HOW do cancer cells get into the brain? A 鈥渢icket鈥� made of three genes seems to grant them access in mice. The discovery could one day lead to drugs that cancel out a similar ticket in people.
Around 10 per cent of people whose cancer has metastasised, or spread beyond the original site, develop brain tumours. But it鈥檚 a mystery how cancer cells get past the 鈥渂lood-brain barrier鈥�, which prevents the passage of most cells.
To investigate, and his colleagues at the Memorial Sloan-Kettering Cancer Center in New York city injected human breast cancer cells into the arteries of mice. Three key genes were expressed in those cells that infiltrated the brain: one that helped cancer cells 鈥渟tick鈥� to blood vessels in the brain, another that is known to make capillaries leaky, and a third that makes cancer cells mobile (Nature, ).
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