HMN 2025: Microscopic beams of radiation may be a better way to treat tumors, according to animal studies

Radiotherapy has been a cornerstone of cancer treatment for many years, offering a targeted approach to treating tumors. However, as effective as it is, it often causes unwanted damage to neighboring healthy tissue – which can lead to many side effects.

But researchers are developing a new technique, which uses narrow X-ray beams, which could offer an alternative method of treating cancer. The therapy could be as effective as conventional radiotherapy – and with fewer complications. It’s called microbe radiation therapy.

Microbes were first studied in the 1960s to examine cosmic radiation. But it wasn’t until the 1980s that they had theirs possibility to treat cancer was inspected. Although microbe therapy has so far only been researched in pre-clinical models, these studies have shown that it is a very successful technique for treating a variety of cancers – and that there are many advantages to radiotherapy as it is.

With conventional radiotherapy, the radiation is spread widely throughout the tumor to kill the cancerous tissue. But this also means that some of the surrounding healthy tissue is more likely to be damaged – with more harmful symptoms.

Microbial radiation therapy uses extremely narrow beams (narrower than a human hair) that are closely spaced together. These high-intensity x-ray beams are delivered in very short bursts – just a fraction of a second. This results in alternating zones of high radiation (“peaks”) and low radiation (“valleys”) – like the teeth of a comb. Although the microbes inevitably affect normal tissue, they do not cause as much damage as broad beams of radiotherapy.

The design of microbe radiation therapy is based on the “dose-volume effect”. This shows that there is a reduction in the amount of tissue exposed to radiation tolerance increases adjacent tissue to damage. But tumor tissues are still affected because they are less capable repair damage compared to the normal ones.

The rapid delivery of this treatment is essential, as even small body movements – such as breathing or heartbeat – can blur this precise pattern, reducing its ability to spare healthy tissue.

Effects of microbes

Preclinical animal studies have shown that radiation therapy can microb Cancer growth is significantly slow by limiting the tumor’s ability to rapidly repair damage. Adjacent healthy tissue was still viable repair themselves after exposure to microbes.

Animal studies have also shown that microbe radiation therapy is effective in treating a range of tumors – including tumors in the central nervous system, breast and skin. Due to the high tolerance of the central nervous system to microbes, the therapy has also been tested as a tool to reduce brain overactivity in the treatment of neurological conditions – such as epilepsy.

This therapy appears to be very beneficial for treating tumors in sensitive areas such as the brain, as it mainly targets the tumor tissue. This means less normal tissue damage, and fewer complications – unlike current radiotherapy, which can cause neurocognitive effects such as memory loss. Microbial radiation therapy could be a vital treatment for children with brain and central nervous system tumors – because their developing brains are more vulnerable to radiation damage.

Another reason microbe radiation therapy may be more effective than conventional radiotherapy is the way the radiation is delivered at ultra-high speed. consumes oxygen inside the cells. This depletion creates a temporary low-oxygen environment, making cells more resistant to radiation. But because tumor cells are often already in low-oxygen areas, they remain at risk of treatment.

The next steps

Microbial radiation therapy is still in the experimental phase. This means that it has not yet been used to treat human patients.

This is partly because the therapy requires advanced facilities, called synchrotrons, to create the right kind of microbes. These facilities are expensive, rare and not suitable for daily clinical use as research is currently the main scope of their application.

But more compact sources are being developed – a possibility produce microbes with suitable characteristics. They could also be used in hospital environments.

Much remains to be discovered about microbe radiation therapy – such as some of the radiobiological processes behind its effects and how to effectively combine it with current therapies. Much work is also underway to scale up the technology for clinical use. These questions must be answered before we can safely use this treatment on patients.

But as research and technology continue to develop, these advances will bring us closer to effective treatment. It is remarkable to think that narrow beams of radiation could have such a profound effect on the way we fight cancer.