Scientists in Belfast have claimed a major breakthrough which they say could lead to more effective treatments for throat and cervical cancers.
Queen's University said the discovery could see the development of new therapies to target non-cancerous cells surrounding a tumour, as well as the tumour itself.
Cancer Research and Cell Biology experts said they found the non-cancerous tissue, or "stroma", surrounding cancers of the throat and cervix plays an important role in regulating the spread of cancer.
Queen's believes this opens the door for the development of new treatments targeting the non-cancerous tissue to help prevent it being invaded by neighbouring cancer cells.
Professor Dennis McCance who led the research said: "Cancer spreads as the result of two-way communication between the cancer cells in a tumour and the non-cancerous cells in the surrounding tissue.
"We already know that cancer cells are intrinsically programmed to invade neighbouring healthy tissue.
"But the cells in the non-cancerous tissue are also programmed to send messages to the cancer cells, actively encouraging them to invade.
"If these messages - sent from the healthy tissue to the tumour - can be switched-off, then the spread of the cancer will be inhibited.
"What we have discovered is that a particular protein in non-cancerous tissue has the ability to either open or close the communication pathway between the healthy tissue and the tumour.
"When the Retinoblastoma protein (Rb) in non-cancerous tissue is activated, this leads to a decrease in factors that encourage invasion by cancer cells. And so, the cancer doesn't spread."
The research was published in the European Molecular Biology Organisation Journal.
Queen's said the Rb protein is found in both cancer and non-cancerous tissue, and that its importance in regulating the growth of cancer cells from within tumours is already well-documented.
But it said this is the first time scientists have identified the role of the Rb found in healthy tissue, in encouraging or discouraging the spread of cancer.
The research was conducted using three-dimensional tissue samples, grown in Professor McCance's lab, to replicate the stroma tissue found around cancers of the throat and cervix.
Speaking about the potential implications for cancer treatment, Professor McCance said: "Current treatments for cancer focus on targeting the tumour itself, in order to kill the cancer cells before they spread.
"This discovery opens the door for us to develop new treatments that would target the normal tissue surrounding a tumour, as opposed to the tumour itself.
"By specifically targeting pathways controlled by the Rb protein, it would be possible to switch off the messages that encourage cancer cells to invade, and inhibit the spread of the tumour.
"Our research has focused on cancers of the throat and cervix. But it is possible that Rb or other proteins in the healthy tissue surrounding other types of cancer, may play a similar role in regulating the spread of tumour cells.
"Therefore, the implications of this discovery could go far beyond throat and cervical cancer, and that is something we plan to investigate further."
The research was funded by the Wellcome Trust, the Experimental Cancer Medicine Centre and the National Institutes of Health (USA), and was supported by the Northern Ireland Biobank.