Researchers from Brazil and Portugal have created a new magnetic nanocomposite designed to attack bone cancer while also supporting bone repair. The work, published in Magnetic Medicine, describes a core -- shell structure made from iron oxide nanoparticles wrapped in a thin coating of bioactive glass. This design allows the material to generate heat when exposed to a magnetic field while remaining firmly attached to bone tissue.

According to the research team, combining these two functions in one material has been a major challenge. The new approach brings together magnetic heating for cancer treatment with properties that encourage bone regeneration.

"Magnetic bioactive nanocomposites are very promising for bone cancer therapy because they can simultaneously ablate tumors through magnetic hyperthermia and support new bone growth," said Dr. Ângela Andrade, lead author of the study. "We found that it is possible to achieve both high magnetization of the nanocomposite and a strong bioactivity in the same material, which has been a long-standing challenge in this field."

Encouraging Results in Bone-Like Conditions

To test how the material behaves in the body, the scientists placed the nanocomposites in simulated body fluid. Under these conditions, the particles quickly formed apatite, a mineral that closely resembles the inorganic portion of natural bone. This rapid mineral formation suggests the material could bond well with bone after implantation.

The researchers also compared different formulations of the nanocomposite. One version, enriched with a higher level of calcium, stood out for its performance.

"Among the tested formulations, the one with a higher calcium content demonstrated the fastest mineralization rate and the strongest magnetic response, making it an ideal candidate for biomedical applications," shared Andrade.

Heating Tumors While Supporting Regrowth

The iron oxide core gives the material its magnetic behavior. When placed in an alternating magnetic field, it can produce localized heat that is strong enough to damage or destroy cancer cells. This process targets tumor tissue while minimizing harm to nearby healthy cells.

At the same time, the bioactive glass coating plays a key role in healing. It encourages surrounding bone tissue to regenerate, creating a treatment strategy that addresses both tumor removal and structural repair in one step.

"This study provides new insights into how surface chemistry and structure influence the performance of magnetic biomaterials," Andrade added. "The findings open new perspectives on the development of increasingly advanced multifunctional materials that are both safe and effective for clinical use."

A Step Forward for Cancer and Regenerative Medicine

Overall, the research marks progress in the development of smart nanomaterials for oncology and regenerative medicine. By combining strong magnetic performance with bone-friendly bioactivity, these nanocomposites point toward future therapies that could treat bone tumors and restore damaged tissue through a single, minimally invasive procedure.