A dye that makes brain tumor tissue glow during surgery
Original title: Hiporfin (HpD) for fluorescence-guided resection of recurrent glioblastoma: diagnostic accuracy and feasibility of an integrated photodynamic strategy
How far along is this research?
This is a preprint. Other scientists have not checked it yet, so treat it as an early signal rather than an answer.
This was an early test in a few people, not approved or standard care.
The short version
A dye made much of the tumor glow, so surgeons could see it better.
What was studied. Adults whose glioblastoma: A glioma that is given grade 4. Grade 4 is the highest grade there is. The tumor grows fast. Treatment usually starts soon after it is found. It often means surgery, and then radiation and chemotherapy. See the glossary came back had surgery with a dye called Hiporfin. They got one dose of 5 mg/kg in a vein before surgery. Surgeons used blue light to look for glowing tissue, then checked 63 tissue samples under a microscope.
What they found. Of the 63 samples, 35 glowed and were tumor, and 7 glowed but were not. 8 samples did not glow but still held tumor. 13 did not glow and were not tumor. The team also used red light in the surgery space in all six patients, with no new nerve problems.
What this means, and what it doesn't
What it could mean: Tissue that glows is likely tumor. That may help a surgeon see what to remove. But tissue that stays dark can still hold tumor, so dark does not mean clear. One drug did two jobs here, guiding surgery and treating the area with light.
What it doesn't mean: This is early work in people. Only six patients had this surgery, so the numbers are small. It does not mean the dye finds all of the tumor. It is not a cure, and it is not standard care today. Most hospitals do not offer this.
Source: medRxiv (preprint), October 9, 2026 · Read the original
This plain-language summary was written by AI and published automatically after passing our automatic safety checks. How we write.