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Scientists Reveal Simple Blood Test Can Detect Cancer Years Before Symptoms Appear
Imagine entering a clinic for a standard blood test and leaving knowing that you may have cancer years from now, long before any symptoms show up.
Although it might sound like science fiction, this scenario might soon come to pass because of recent discoveries made by Johns Hopkins University researchers.
A blood test that can identify cancer up to three years before it would normally be identified with existing techniques was revealed by researchers in a ground-breaking study that was published in Cancer Discovery.
This breakthrough could fundamentally change the way we treat one of the most deadly illnesses in the world, shifting our focus from treatment to prevention.
How Cancer Leaves Clues in the Blood
Tiny pieces of DNA are released into the bloodstream by all cells, including malignant ones. We refer to these pieces as circulating tumour DNA (ctDNA). Although DNA is also released by healthy cells, tumour DNA contains particular mutations or indicators that point to a problem.
Using cutting-edge genetic sequencing methods, the Johns Hopkins researchers took advantage of this biological breadcrumb trail. They examined 52 blood samples, 26 from people who were later diagnosed with cancer and 26 from people who were cancer-free, that had first been taken for cardiovascular research.
Eight of the 26 samples from individuals who would subsequently obtain a diagnosis had cancerous symptoms effectively identified by the test they employed, known as a Multicancer Early Detection (MCED) test. Of those eight, four exhibited robust genetic markers that were directly associated with tumour activity.
Why Detecting Cancer Sooner Matters
Most people agree that one of the most effective ways to combat cancer is through early detection. When a tumour is still tiny and hasn’t spread, the majority of treatments are less aggressive and more effective.
Early detection of cancer significantly increases survival rates. The five-year survival rate for localised breast cancer is approximately 99%, but it drastically declines once the cancer has spread, according to the American Cancer Society.
Lead researcher Dr. Yuxuan Wang put it plainly: “Three years earlier provides time for intervention. The tumors are likely to be much less advanced and more likely to be curable.”
Consider it similar to seeing a match before it spreads like wildfire.
Not Without Questions: The Hurdles Ahead
Scientists are quick to note that we’re still in the early stages, despite the test’s impressive potential. Another senior team member, Dr. Nickolas Papadopoulos, stressed the need of determining what occurs following a positive test.
When no tumour is evident, what kind of follow-up care is appropriate? Would individuals have needless scans or biopsies?
Then there’s the accuracy problem. Tests for early cancer diagnosis must balance the risks of false negatives, which could completely miss early malignancies, with false positives, which could trigger anxiety and needless treatments.
The World Health Organization’s epidemiologist Dr. Hilary Robbins weighed in with a cautionary note. “Screening interventions that are done on very broad swaths of the population — most of whom will not benefit — should be very well characterized,” she said. “And their benefits should be proven before they’re rolled out.”
The Bigger Picture: Could This Replace Traditional Screening?
It’s intriguing to consider the possibility of a universal blood test for cancer. Historically, different cancers have required separate screening methods, such as colonoscopies for colorectal cancer, mammograms for breast cancer, and so on. However, the goal of MCED tests is to combine detection into a single, standard, minimally invasive process.
Similar tests that can screen for more than 50 types of cancer with a single blood sample are already being investigated by companies like Grail, which is supported by tech giant Illumina. These new methods are a part of a developing area called liquid biopsy, which uses physiological fluids like blood or saliva to diagnose tumours, providing an alternative to traditional tissue biopsies.
In addition to potentially eliminating the need for more intrusive and difficult diagnostic procedures, liquid biopsies have the potential to detect cancer at its most treatable stage if they are widely used and improved.
What Comes Next?
The Johns Hopkins team intends to use larger and more varied participant groups in their future research. Although the 52-person sample size is encouraging at this time, it is insufficient to alter therapeutic practice. They must also respond to important queries such as:
- Which tumours are the simplest (or most difficult) to find with this technique?
- How frequently would the test need to be taken?
- Might this be included in a yearly physical examination?
The U.S. Food and Drug Administration (FDA) and other regulatory agencies will be crucial. It may take years for such tests to undergo extensive testing, validation, and approval before they are made publicly available.
Hope On The Horizon
One thing is certain despite the numerous obstacles: a new age in cancer diagnostics is upon us. Our entire healthcare system may change from being centred on late-stage therapy to one that is based on early intervention and prevention if it is possible to detect cancer years before symptoms manifest.
“This study shows the promise of MCED tests in detecting cancers very early, and sets the benchmark sensitivities required for their success,” as Dr. Bert Vogelstein, another important participant in the study, expressed it best.
Your yearly physical may soon reveal more than just your vitamin and cholesterol readings. Long before cancer has a voice, it can be silently listening for the first signs of illness, offering you a fighting chance.
The Promise: Catching Cancer in the Bloodstream
Blood plasma samples that were initially gathered for cardiovascular study were examined by the Johns Hopkins researchers. Their Multicancer Early Detection (MCED) test accurately identified 8 instances exhibiting early indicators out of 26 volunteers who ultimately got cancer; four of those cases exhibited tumor-linked genetic alterations long before symptoms appeared.
Lead researcher Dr. Yuxuan Wang stressed the significance of this early advantage:
“Three years earlier provides time for intervention. The tumors are likely to be much less advanced and more likely to be curable.”
The concept is strong: why not identify cancer at the molecular level when it is still subtly developing, rather than waiting for symptoms or imaging to appear?
The Bigger Picture: Supporting Research and Developments
There are other studies investigating the possibility that blood could include cancerous early warning signals. The same objective has been pursued by a number of other researchers and organisations, cautiously but enthusiastically.
Grail’s Galleri Test: A Commercial Leap into Liquid Biopsy
The Galleri test, created by the California biotech company Grail, is arguably the most well-known illustration of MCED in action. With just one blood sample, it can identify over 50 different forms of cancer, according to Illumina.
The test looks for chemical alterations on DNA called methylation patterns, which may indicate the presence of cancer cells.
Real-world outcomes, however, differ. For example, Galleri’s sensitivity decreases for early-stage tumours, which are the ones where the greatest number of lives could be spared, but it exhibits good accuracy in detecting late-stage cancers.
Some physicians are still worried that tests like Galleri may result in overdiagnosis and needless operations, as The New Yorker noted in an article headlined “The Catch in Catching Cancer Early” from June 2025.
They caution against lead-time bias, which is the delusion of better survival based only on the early detection of the disease rather than an improved outcome.
The Science: How Does It Work?
The way liquid biopsy and MCED technologies operate is by detecting circulating tumour DNA (ctDNA), which are DNA fragments released into the circulation by cancer cells. High-throughput sequencing, which examines blood for identifying mutations or epigenetic alterations, can be used to detect this genetic trash.
According to a study from Johns Hopkins, these tests can detect indications of tumours that are still too small for imaging or physical symptoms, in addition to recognised cancers. That would be the same as detecting smoke before a fire has even started.
Challenges Ahead: What Happens After a Positive Test?
Doctors may still be faced with the following conundrum even if a blood test identifies early cancer symptoms:
- Where is the tumor?
- Is it aggressive or slow-growing?
- Should we treat it now or wait?
One of the senior authors of the Johns Hopkins study, Dr. Nickolas Papadopoulos, acknowledged that figuring out how to respond to these early warnings is the next challenge. The foundation of current cancer therapy procedures is early identification. Diagnostics and medicine may need to advance together.
A Future in Sight: Routine Cancer Screening by Blood?
A yearly blood test that checks for dozens of malignancies might soon become a reality. Currently, the majority of people only get cancer screenings for certain conditions (such as cervical, breast, or colon cancer), but MCED technology has the potential to change that. We can now look forward to a time when cancer detection is as simple as a cholesterol check.
Dr. Bert Vogelstein of Johns Hopkins, a pioneer in the field of cancer genetics, is hopeful:
“This study shows the promise of MCED tests in detecting cancers very early, and sets the benchmark sensitivities required for their success.”
However, he and his colleagues agree that more extensive trials, a wider range of patients, and practical application studies are required to demonstrate the test’s full potential.
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