The chances of beating aggressive breast cancer were raised for women who had "killer" T-cells near their tumour, a study has found.
The killer T-cells destroy cancerous cells by blasting them with toxic proteins and patients found to have them were 10% more likely to live for five years or more than a breast cancer sufferer without them.
The association was seen in women with non-hormone sensitive breast cancer and cancers marked by especially active HER2 genes.
Lead researcher Dr Raza Ali, a lecturer at the Cancer Research UK Cambridge Institute, explained: "This important insight could help doctors personalise a woman's treatment based on her immunological profile and also suggests new treatments should harness the immune system to fight cancer."
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Cloud and outbreaks of rain will ease away eastwards during the morning, clearing the east coast around midday with sunny spells developing.
Police and emergency services are attending the scene.
Rebel-held east remains at risk while the pumping station supplying the western part of the city is once again in operation.