Not all tumours are solid. Mesothelioma, for example, is a cancer that grows in the mesothelium – the membrane surrounding the lungs. The spread of mesothelioma makes it difficult to target this cancer with a radiation beam without causing unwanted damage to the lungs and other vital healthy tissues. For such cancers, it would be beneficial to introduce the active components of radiation therapy into the mesothelial layer, without using high energy X-ray or electron beams.

Figure 2: A) Ionising radiation passing through cells in the body create free radicals in and around cells to form RONS. (B) Gas plasma, already containing RONS, can interact directly with cells, or (C) can impart the radicals to a liquid for injection deep in the body.

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