At this point I would just go for the dog dewormer (fenbendazole) others have already mentioned.
For a patient with rapidly progressing and multiple metastatic cancer, she recommended taking fenbendazole 222mg four times a day for three weeks, taking 222mg for once or twice a day after the third week, and giving a break for four days.
To increase the absorption rate, patients should take the drug immediately after meals or take the deworming pill with 60-100cc olive oil so that bile can be secreted.
source: https://www.koreabiomed.com/news/articleView.html?idxno=6835
related: https://georgetownmarket.com/a-canine-de-wormer-for-cancer-treatment/
Good luck.
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