The “Discussion” section of the following paper indicates, first, no, then perhaps yes so it’s unclear (to me) - plus this study wasn’t directed at its efficacy against cancer. 2018, NIH so take it for what it’s worth.

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5929173/

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I have no idea, am not a medical person and would have to go back in my health file and study some of the posts again - then do research. In this post’s article comments section I thought it was the “dog dewormers” he/she was referring to - which would be the fenbenzadole (if I’m not mistaken) - that are used against cancer.

You’re questioning if ivermectin (and/or fenbenzadole) work(s) specifically on brain cancer (vs other cancers in the body). The article commenter, Lynn Kramer, seems to think they do and the second commenter, Bk, an alleged cancer suffer him/herself seems to think ivermectin, in particular, would be beneficial to their battle with cancer. Do these people have any standing to make those claims? No idea. It’s up to individuals to take in as much information as possible, research then make their own decisions.