Protein could offer therapeutic target for pancreatic cancer

A protein that drives growth of pancreatic cancer, and which could be a target for new treatments, has been identified by researchers at the Crick. The study, published in Nature Cell Biology, looked into the most common type of pancreatic cancer, pancreatic ductal adenocarcinoma. This is an aggressive cancer that develops from secretory and tubular cells of the pancreas. There are no effective therapies to treat this cancer and only 8% of patients survive beyond five years after diagnosis. The researchers analysed a specific group of tumour cells, called cancer stem cells. Similar to how healthy human stem cells repair tissues and organs, these cells have the ability to start new tumours and they can also differentiate into different types of tumour cells. As these cells are a driving force behind cancer growth, being able to identify if they are present is an important step towards the development of new treatments. By analysing the gene expression of these cancer stem cells, the team found that a protein, called CD9, is present on their surface both when the tumour is developing and when it is more established. This protein could therefore be used as a marker to help locate these cells. The study further established that this protein is not just a marker of cancer stem cells, but also promotes their malignant behaviour. The researchers altered the amount of CD9 in tumour cells in mice and found that when the levels of this protein were reduced, smaller tumours formed. Conversely, increasing levels of CD9 made cancer cells more aggressive and able to form large tumours quickly. These findings were supported by existing clinical data showing that patients whose tumour cells have more CD9 have a poorer clinical prognosis. About 10% of people with this type of cancer have amplified levels of CD9.

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