Primary bone tumors such as osteosarcoma have seen stagnant survival rates over the past four decades. Surgical removal of the tumor is critical, but local recurrence can occur when the tumors are close to vital structures, often resulting in amputation. In addition, these procedures are associated with significant bone loss and implant failure due to infection.
An international team of researchers led by the Royal Orthopedic Hospital NHS Foundation Trust, Aston University and the Brazilian Aeronautics Institute of Technology has developed an advanced synthetic grafting material. By incorporating gallium oxide into the traditional “Bioglass 45S5” matrix, they created a multifunctional material that simultaneously eliminates residual cancer cells, prevents bacterial colonization, and regenerates missing bone tissue.
Our multifunctional biomaterial acts as a localized drug delivery system, offering a therapeutic strategy to selectively destroy residual cancer cells where surgery was performed, while providing calcium, phosphate and silicon ions required for healthy bone growth.”
Dr Lucas Souza, principal investigator of the study from the Royal Orthopedic Hospital NHS Foundation Trust
“This development leads us to new frontiers in both treatment and prophylaxis against the most devastating complications of limb salvage surgery, especially local recurrence and infection, which are limb-threatening and endanger patient survival,” says co-author Jonathan Stevenson, Consultant Orthopedic Oncology Surgeon at Hoppital Orthopedic Oncology.
Through high-throughput RNA sequencing, the team uncovered a highly selective molecular mechanism.
“Because bone cancer cells overexpress transferrin receptors to fuel their rapid growth, they take up four to eight times more gallium than healthy cells,” says Souza. “Once inside malignant cells, gallium mimics iron but cannot participate in essential redox reactions. This causes immediate iron depletion, overwhelming oxidative stress, and a devastating cellular crisis that forces cancer cells to follow apoptotic and iron-depleting pathways of self-destruction.”
In contrast, healthy bone cells easily manage temporary stress through natural antioxidant mechanisms and fully recover within days.
In addition to its powerful anti-cancer properties, the material also helps prevent surgical site infection. “The optimal 5% gallium glass formulation completely inhibited the growth of the aggressive, gram-negative pathogen Pseudomonas aeruginosa“This dual therapeutic action effectively seals off the surgical site from deadly hospital-acquired infections while the vitreous degrades to make room for brand-new bone.
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