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Old 31-03-20, 07:42   #1
 
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Red Arrow Blood Test Can Check for 50 Types of Cancer

Blood Test Can Check for More Than 50 Types of Cancer

BBC News, 31 MAR 2020


A simple blood test can check for more than 50 types of cancer, often before any signs or symptoms, scientists say.

It could help diagnose tumours sooner, when they are easier to treat and, ideally, cure, experts hope.

More than 99% of positive results are accurate, the team says, but it will be crucial to check it does not miss cases and provide false assurance.

Doctors are using it in trials with patients but more studies are needed, they say in Annals of Oncology.

Trial data suggests it is better at detecting more advanced disease rather than the beginnings of cancer, which may limit how useful it becomes.

How does it work?


The test looks for telltale chemical changes to bits of genetic code - cell-free DNA - that leak from tumours into the bloodstream.

The researchers, from the Dana-Farber Cancer Institute and Harvard Medical School, working with UK colleagues from The Francis Crick Institute and University College London, tested more than 4,000 samples from patients - some with and some without cancer.

More than 50 types of cancer, such as bowel, lung and ovarian, were included.

And in 96% of the samples, the test accurately detected the type of cancer.

What do experts say?


The study is funded by Grail, the maker of the blood test.

One of the lead researchers, Prof Geoff Oxnard, said: "This blood test seems to have all the features needed to be used on a population scale, as a multi-cancer screening test.

"Everyone asks when will a test like this will be ready for use.

"Based upon this successful clinical validation in thousands of patients, the test has actually now been launched for limited use on clinical trials.

"But before this blood test is used routinely, we will probably need to see results from clinical studies like this to more fully understand the test performance.

"Certainly the field is moving quickly and it makes us hopeful that blood-based cancer detection will be a reality."

Cancer Research UK early detection head Dr David Crosby said: "Detecting cancers at their earliest stages, when they are less aggressive and more treatable, has a huge potential to save lives and we sorely need tech innovations that can turn this potential into reality.

"Although this test is still at an early stage of development, the initial results are encouraging.

"And if the test can be fine-tuned to be more efficient at catching cancers in their earliest stages, it could become a tool for early detection.

"But more research is needed to improve the test's ability to catch early cancers and we still need to explore how it might work in a real cancer-screening scenario."
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