Scientists at the Queensland University of Technology (QUT) in Australia have developed a new saliva test that could help doctors detect several types of cancer much earlier than before. The new method is simple, quick, and inexpensive, and it may one day allow doctors to screen patients for cancer using nothing more than a small saliva sample.
Early detection is one of the most important factors in successfully treating cancer. When cancer is discovered at an early stage, doctors often have more treatment options, and patients usually have a much higher chance of recovery.
Unfortunately, many cancers are not discovered until symptoms appear, which may happen after the disease has already progressed.
Because of this, scientists around the world are searching for easier ways to identify cancer early. Many current diagnostic methods involve blood tests, scans, or biopsies, which can be costly, time‑consuming, and sometimes uncomfortable for patients. A simple saliva test could make screening much easier and more accessible.
The new study from QUT focuses on detecting a protein called S100P. Proteins like S100P can act as biomarkers. A biomarker is a measurable substance in the body that may indicate the presence of a disease.
Researchers have previously linked S100P with several different types of cancer, including oral cancer, colon cancer, and pancreatic cancer. The protein has also been observed in cancers such as ovarian, prostate, gastric, colorectal, and breast cancer.
The research team designed a testing method that can detect this protein quickly in saliva samples. Their work was published in the scientific journal Talanta in a paper titled “Label free paper sensor and light driven material for the rapid screening of S100P cancer biomarker in saliva.”
The project was led by Associate Professor Emad Kiriakous from QUT’s School of Chemistry and Physics. According to Professor Kiriakous, the goal of the research was to create a screening tool that is affordable, fast, and easy to use, especially in clinics or locations that may not have access to advanced laboratory equipment.
To build the test, the researchers created a special paper sensor coated with tiny particles of gold and silver. These microscopic particles help the sensor detect extremely small amounts of the S100P protein. When a saliva sample is placed on the paper, the sensor uses a light‑based technique to analyze the molecules present in the sample.
This technique is called Raman spectroscopy, a scientific method that studies how molecules scatter light from a laser.
By measuring how the light changes after interacting with the sample, scientists can identify specific molecules present in the saliva. A more sensitive version of this method, known as surface‑enhanced Raman scattering (SERS), was used in the study to detect the cancer biomarker.
To make the test work reliably, the team also created a special paper extraction chip that captures the S100P protein from saliva before the measurement takes place. This step improves the accuracy of the test and helps ensure that the sensor is measuring the correct biomarker.
Another important feature of the technology is the way the sensor is produced. The researchers used a process that relies on deep ultraviolet LED light to attach antibodies to the paper surface.
Antibodies are molecules that can recognize and bind to specific proteins, such as S100P. This process avoids the complex chemical steps that are usually required in biosensor manufacturing.
Using light instead of traditional chemical reactions also reduces chemical waste and makes the process more environmentally friendly. The team describes this as a “green synthesis” approach, meaning it uses safer and more sustainable methods to produce the testing materials.
One of the most promising aspects of the new test is its speed. According to the researchers, the system can deliver results in about one hour. In many medical settings, diagnostic tests can take several hours or even days to produce results, especially if samples must be sent to specialized laboratories.
The ability to perform rapid testing at the point of care could significantly improve early cancer screening. Doctors might one day use a portable device in clinics, community health centers, or even remote areas where laboratory facilities are limited.
Another advantage of the method is that saliva is much easier to collect than blood samples or tissue biopsies. Saliva testing is painless, non‑invasive, and can be performed quickly without specialized medical procedures. This could encourage more people to undergo routine screening, increasing the chances of catching cancer early.
While the technology is still in the research stage, it represents an important step toward developing simple diagnostic tools for cancer detection. If further studies confirm its effectiveness in real clinical settings, the saliva test could become part of regular health checkups in the future.
However, it is important to note that this early research mainly demonstrates the technical feasibility of the sensor. More clinical testing will be needed to determine how accurately the test detects cancer in large groups of patients. Scientists will also need to study whether other conditions might affect the levels of the S100P protein in saliva.
Despite these challenges, the study highlights the growing potential of biosensors and saliva‑based diagnostics. By combining nanotechnology, light‑based detection methods, and portable materials, researchers are developing new ways to identify disease quickly and affordably.
If technologies like this continue to improve, they could transform how doctors screen for cancer. Faster and simpler tests could lead to earlier diagnosis, earlier treatment, and ultimately better outcomes for patients.
The research was published in the journal Talanta and represents an important advance in the effort to develop practical tools for early cancer detection.
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