Researchers use light-activated nanozymes to treat aggressive brain tumors

The Future of Neuro-Oncology: How Nanozymes are Redefining Brain Tumor Treatment

For decades, the treatment of malignant brain tumors has been a battle against both the cancer itself and the body’s own defense mechanisms. Conventional therapies—surgery, radiation, and chemotherapy—often hit a wall when facing aggressive tumors like astrocytomas. The challenge isn’t just the tumor’s growth, but its tendency to invade healthy surrounding tissue, making complete surgical removal nearly impossible.

However, a paradigm shift is occurring. Researchers at Empa and the hospital network HOCH Health Ostschweiz are pioneering the use of nanozymes—biocompatible nanomaterials that act as catalysts—to attack cancer cells directly during surgery. This approach represents a broader trend in precision medicine: moving away from systemic treatments toward localized, high-impact interventions.

Breaking the Barrier: The Strategic Shift to Localized Delivery

The most significant hurdle in treating astrocytomas is the blood-brain barrier. Because this barrier is so effective, many traditional drugs never reach their target in sufficient concentrations. The future of neuro-oncology lies in “circumventing” this barrier rather than trying to force drugs through it.

By applying nanomedicine directly on-site during surgery, surgeons can bypass the blood-brain barrier entirely. According to Empa researcher Giacomo Reina, these drugs specifically accumulate in tumor tissue because cancer cells possess a particularly active metabolism. This ensures that the treatment hits the malignancy while sparing the surrounding healthy brain tissue.

The Power of Near-Infrared (IR) Light

One of the most exciting trends in this field is the integration of external triggers to activate medication. Nanozymes can be engineered to remain dormant until they are triggered by near-infrared light. This allows for:

• Extreme Precision: Doctors can control exactly when and where the medication becomes active.
• Reduced Toxicity: Because the activation is localized, the overall dosage can be kept to a minimum, significantly reducing systemic side effects.
• Deep Penetration: Due to their tiny size, these nanomaterials can penetrate several millimeters into the tissue, targeting malignant cells that the surgeon’s scalpel cannot reach.

Beyond Surgery: The Rise of Material-Based Oncology

The development of nanozymes is part of a larger movement toward material-based approaches to cancer. Empa’s oncology initiative, running from 2025 to 2035, highlights a trend toward treating cancer based on the genetic and metabolic fingerprint of the individual patient.

This personalized approach is critical because of the devastating statistics associated with astrocytomas. In seven out of ten cases, the cancer returns after treatment, and the five-year survival rate is currently only about five percent. The goal of future nanomedicine is to prevent these relapses, even in cases where the cancer has become resistant to conventional chemotherapy.

Expanding the Horizon: Spinal Cord and Thyroid Tumors

While the current focus is on the brain, the implications of nanozyme technology extend much further. Experts believe this approach has promising potential for treating other tumors of the spinal cord and brain. The integration of advanced 3D imaging—currently being used to analyze thyroid carcinomas—allows for non-destructive analysis of biopsy samples, providing a clearer roadmap for how to apply these nanomedicines.

For more information on the evolution of oncology, explore our guide on the latest in nanomedicine or visit the Empa research portal.

FAQ: Understanding Nanozymes and Brain Tumor Trends

What exactly are nanozymes?

Nanozymes are biocompatible nanomaterials that possess enzyme-like activity. They can activate drug precursors or generate reactive oxygen compounds that specifically damage and destroy tumor cells.

Why are astrocytomas so demanding to treat?

Astrocytomas are aggressively growing tumors that invade healthy brain tissue. Their location behind the blood-brain barrier makes drug delivery difficult, and they have a high relapse rate (70%).

How does near-infrared light help in cancer treatment?

Near-infrared light acts as a “remote control” for certain nanomedicines. It allows doctors to activate the drug only in the specific area where the tumor is located, minimizing damage to healthy cells.

Can this technology help if chemotherapy has failed?

Yes. Researchers hope that because nanozymes use a different mechanism of action than traditional drugs, they could potentially prevent relapses even in tumors that have become resistant to conventional chemotherapy.