Health
Diamond Sensors Offer New Hope for Tracing Breast Cancer Spread
UK researchers have developed a novel diamond-based sensor that could transform the way doctors track the spread of breast cancer, offering a safer and less invasive alternative to existing methods.
When breast cancer spreads, it often first reaches the lymph nodes near the tumour. Determining whether cancer has metastasised to these nodes is a critical step in treatment planning. Traditionally, doctors have relied on radioactive tracers or fluorescent dyes to identify affected nodes. However, these methods come with drawbacks: some patients are allergic to the dyes, while the use of radioactive materials requires specialised facilities and safety precautions that are not always available in hospitals.
The new technique, designed by scientists at the University of Warwick, uses tiny diamond sensors to trace the cancer’s route. Before or during surgery, doctors could inject a magnetic tracer fluid into the tumour. This liquid travels through the lymphatic system, mimicking the movement of cancer cells. The breakthrough lies in a diamond-tipped magnetic field sensor that can then detect the tracer inside the lymph nodes, allowing surgeons to identify which ones need removal.
Diamonds contain unique properties known as nitrogen vacancy centres, or colour centres, that are highly sensitive to changes in magnetic fields. These centres not only make diamonds an effective detector but also give them a distinct pink hue. “These colour centres allow the diamond to detect very small changes in magnetic field and give the diamonds a lovely pink colour,” explained Professor Gavin Morley, a physicist at the University of Warwick and one of the study’s authors.
The Warwick team succeeded in miniaturising the sensor’s tip to just 10 millimetres, making it small enough for use in surgery while retaining the sensitivity needed to detect magnetic tracer fluids. This marks the first time a diamond-based sensor of this size has been capable of detecting the tracers, according to the study published in Physical Review Applied.
Importantly, the researchers stressed that their work did not receive financial support from Endomagnetics Ltd, the company that manufactures the magnetic tracer used in the experiments.
Experts in the field have welcomed the development. Dr Stuart Robertson, a breast cancer surgeon in England, noted that magnetic sensors are already widely used to assess whether breast cancer has spread. The diamond sensor, he said, could further “optimise magnetic technology” and improve surgical outcomes.
If proven effective in clinical settings, the diamond-based sensors could provide doctors with a safer, non-radioactive tool to guide treatment while sparing patients from potential side effects associated with current techniques. The innovation adds to the growing use of magnetic technologies in oncology, raising hopes for more precise and patient-friendly cancer care in the future.
Health
Global Mental Health Cases Near 1.2 Billion as Anxiety and Depression Drive Sharp Worldwide Rise
A major global analysis has found that mental health conditions have surged to an estimated 1.2 billion people worldwide, driven largely by steep increases in anxiety and depression over the past three decades.
The findings, published in The Lancet as part of the Global Burden of Disease Study 2023, show that the number of people living with mental disorders has almost doubled since 1990, marking a 95% rise. Researchers say major depressive disorder and anxiety disorders have seen even sharper growth, increasing by 131% and 158% respectively, making them the most prevalent mental health conditions globally.
The report describes mental illnesses as widespread conditions that create long-term disability and significant human suffering. It also highlights broader consequences for economies and public services, including reduced productivity, lower workforce participation and increasing pressure on health and welfare systems.
Researchers estimate that in 2023 alone, around 620 million females and 552 million males were affected by mental health conditions. While the overall burden is rising across both sexes, the study points to notable differences in the types and prevalence of disorders.
Among women, depression and anxiety were the most commonly reported conditions, alongside higher rates of eating disorders such as anorexia nervosa and bulimia nervosa. The report links this disparity to a mix of biological, social and structural factors, including exposure to domestic violence, sexual abuse, gender inequality and reproductive health-related changes.
In contrast, neurodevelopmental and behavioural disorders, including attention deficit hyperactivity disorder (ADHD), conduct disorder and autism spectrum conditions, were more frequently diagnosed in men.
Teenagers aged 15 to 19 were identified as the group experiencing the highest mental health burden globally, raising concerns about early onset of conditions and insufficient preventive care for young people.
The study identifies several key risk factors associated with mental illness, including childhood sexual violence, bullying and intimate partner violence. These factors are strongly linked to conditions such as depression, schizophrenia, bipolar disorder and anxiety disorders. However, researchers note that such exposures have remained relatively stable over time and account for only a portion of the overall rise.
According to the authors, broader drivers are likely contributing to the increasing prevalence of mental disorders. These include genetic and biological influences, poverty, inequality, and the growing impact of global crises such as armed conflict, pandemics, natural disasters and climate-related stress.
While mental health conditions have long been a leading cause of disability worldwide, the report warns that the situation is worsening. At the same time, health systems have not expanded services at a pace matching demand.
The authors caution that the gap between rising need and limited access to care is becoming more pronounced, leaving millions without adequate treatment or support.
Health
Europe Records Sharp Rise in Sexually Transmitted Infections, ECDC Warns
Health
White House Rejects Report It Blocked Return of Ebola-Infected US Doctor
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