Detecting melanoma before it becomes visible is very difficult in medicine. Researchers in Canada have created a new system called SMEAR-ULM. It is designed to find skin cancer at a very early stage. The work comes from Université de Montréal and the Institut national de la recherche scientifique. The study was published in the Journal Nature Sensors.
The project was led by Professor Jinyang Liang at INRS. Other researchers such as Fiorenzo Vetrone and Sylvain Meloche also contributed. The team worked together across several universities and research labs.
Skin cancer cases, especially melanoma, are increasing in Canada. Early detection is essential for saving lives. Current diagnosis usually depends on visual checks by doctors. If needed, doctors take biopsies from the skin. This process can be invasive and sometimes unnecessary.
The new system aims to improve this process. It provides a fast and non-invasive way to study skin lesions. It may reduce the number of unnecessary biopsies. It could also help doctors make better decisions. SMEAR-ULM works by measuring tiny temperature changes on the skin surface. Cancer cells produce more heat because they are more active metabolically. These temperature changes are too small for normal tools to detect. The system makes them visible through advanced optical techniques.
The method uses a small patch with painless microneedles. These microneedles place special nanoparticles just under the skin. The nanoparticles act like tiny thermometers. They form a kind of temporary intelligent tattoo. When near-infrared light shines on them, the nanoparticles glow. The glow lasts for different times depending on temperature. Warmer areas change the light signal in a measurable way. Cancer areas usually appear slightly warmer than healthy tissue.
A high-speed imaging system records this light in a single shot. It creates a detailed temperature map of the skin. The system can detect tiny changes with high precision. It is fast enough for real-time monitoring. In animal studies, the system detected micro-melanomas only four days old. These tumors are too small for normal imaging methods. Standard thermal imaging usually detects only larger tumors above five millimeters.
Existing methods also suffer from noise and low resolution. They cannot provide very precise temperature maps. Repeated measurements are often needed in older systems.
The SMEAR-ULM system combines several advanced technologies. It merges microneedles, nanoparticles, and ultrafast optical imaging. This combination allows real-time and accurate thermal mapping. The researchers say the system turns skin temperature into a useful biomarker. It helps identify cancer at its earliest and most dangerous stage.
The technology is still in early testing and was done in mice. However, the mouse model reflects many genetic features of human melanoma. Scientists believe it could one day be useful in human clinics. It may support doctors in making faster and more accurate diagnoses.
Beyond melanoma, the platform may have wider medical uses. It could help measure other signals like pH or ion levels. This may open new paths for medical imaging and diagnostics. The system is designed to be minimally invasive and safe for patients. Researchers hope it will improve early cancer screening in the future. Further clinical trials will be needed before real-world use begins.
If it is successful, it could reduce healthcare costs and improve survival rates for many people. It also shows a new direction in optical biomedical imaging and cancer research fields. Scientists are very excited, and they believe it might change hospital practices slowly over time. Further studies are necessary, and the results remain unconfirmed. The method also could help doctors detect diseases earlier than usual scans, maybe even before symptoms appear in some cases. It brings hope for faster diagnosis, better treatment planning, and improved patient monitoring in long-term healthcare systems worldwide.
