London: A new imaging technique developed at the University of Oxford may be able to detect cancers that have spread to the brain even when tumours are small. The study, carried out on mice, investigated a new `dye` that shows up in MRI scans, a university release said. The scientists showed that the dye, or contrast agent, recognises and sticks to a molecule called VCAM-1. This molecule is present in large amounts on blood vessels associated with cancer that has spread to the brain from other parts of the body. MRI scans show the distribution of the dye in the brain, enabling much smaller tumours to be detected than can be done using current techniques. Small tumours can be treated with whole brain radiotherapy or surgery, and there are new chemotherapy treatments in development. But currently, it is only possible to detect larger secondary brain tumours, and these are more difficult to treat, the release added.
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