Blood test can detect five types of cancer FOUR YEARS before symptoms appear

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Blood test can detect five types of cancer FOUR YEARS before symptoms appear — including tumours in the lungs and liver

  • PanSeer test can detect stomach, oesophagus, bowel, lung and liver cancer
  • Their findings could help identify those at high risk of developing the disease 
  • Analysed plasma samples from 605 people who didn’t have any symptoms

By Isabella Nikolic For Mailonline

Published: | Updated:

A simple blood test can detect five types of cancer up to four years before any symptoms appear, scientists claim.  

The ‘liquid biopsy’, called PanSeer, analyses blood samples for tiny DNA fragments released by stomach, oesophagus, bowel, lung and liver tumours. 

The team of US and Chinese scientists found it could detect the different types of cancer up to four years before standard diagnosis methods.

Current screening techniques involve imaging tests or conventional biopsies – which see part of on organ removed to be inspected for signs of the disease.

Liquid biopsies are hoped to revolutionise cancer treatment by identifying people with slow-growing tumours.   

It is not the first type of blood test that doctors have created for diagnosing cancer earlier than traditional screening methods. But few have been able to spot tumours before symptoms occur. 

A new blood test can detect five types of cancer up to four years before symptoms appear, according to a new study. Stock picture 

HOW TO TELL IF A LUMP COULD BE CANCER

Cancer Research UK says all lumps or swellings which don’t go away should be taken seriously and deserve a doctor’s opinion.

Most cancers produce tumours, which are growing lumps of cells which can produce noticeable lumps if they’re close to the surface of the skin.

If you cannot explain where a lump has come from and it’s not connected to a physical injury like a bruise, it may be cause for concern.

Cancerous lumps are usually hard and painless to touch, although they may ache at times. Lumps which can be felt usually appear in the breasts, testicles, neck or armpits, but potentially also on the arms or legs.

If the appearance of the lump is accompanied by feelings of severe tiredness, night sweats, breathlessness, or unexplained weight loss it could be a sign of cancer.

Always visit a doctor if you are worried about a lump or the symptoms above. 

Sources: Cancer Research UK; Cleveland Clinic 

The simple blood test offers rapid diagnosis, before cancer starts to spread through the body. 

Scientists are now able pinpoint the part of the body affected using liquid biopsies because cells killed off by cancer release DNA into the bloodstream, which has its own unique signature. 

Experts have praised the ‘exciting’ results of the study, which was published in the journal Nature Communications. 

But they warned it is too soon to say the pioneering test actually works and called for larger trials on thousands of patients to confirm the early results. 

Professor Kun Zhang, one of the authors on the study and based at the University of California, San Diego, said: ‘The ultimate goal would be performing blood tests like this routinely during annual health check-ups.

‘But the immediate focus is to test people at higher risk, based on family history, age or other known risk factors.’

The authors analysed samples of plasma — a straw-coloured liquid found in the blood — from 605 people who did not show any symptoms of any of the five different cancers.

Almost 200 of the participants were later diagnosed with one of the diseases.

The scientists also looked at specimens from an additional 223 diagnosed cancer patients to train the test so it knew how to spot tumours by scouring the blood.  

Results showed PanSeer was able to spot cancer in 95 per cent of the participants who did not have any symptoms when the samples were collected and were only diagnosed with the disease later.

It also flagged cancer in 88 per cent of the samples from 113 patients already diagnosed with the disease.

The technique involves spotting the tell-tale signs of cancer based on very small levels of tumour DNA circulating in the blood.

In addition, the test correctly identified healthy samples 95 per cent of the time.

Blood tests to detect cancer have become the focus of numerous scientific studies in the recent years as they offer a way to screen patients without the need for invasive surgery.

But the researchers said their work is unique because they had access to blood samples from patients who did not have symptoms.

This, they said, allowed them to develop a test that ‘can find cancer markers much earlier than conventional diagnosis methods’. 

The researchers wrote: ‘These results demonstrate that cancer can be non-invasively detected up to four years before current standard of care.’