The short version is that there are some really exciting developments here about mRNA vaccines, based on genomic sequencing of tumor cells, that seem to be having a beneficial effect on the dog in question.
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https://www.theaustralian.com.au/business/technology/tech-boss-uses-ai-and-chatgpt-to-create-cancer-vaccine-for-his-dying-dog/news-story/292a21bcbe93efa17810bfcfcdfadbf7