Published in the journal Pharmaceutics in September 2021, this study specifically looked at the effects of CBD isolate treatments on bladder cancer cells in vitro (outside living organisms).
The study used CBD isolate in laboratory "glass" and found that there was a distinct inhibition of bladder cancer cell migration and growth. Another interesting aspect of the study showed that CBD enhanced the adhesion of other compounds to the bladder wall, thus increasing absorption and prolonging the medication time. The study is very technical, but the results suggest there is more reason to believe that CBD may help treat bladder cancer through several mechanisms.
"...this work demonstrates that CBD may become a novel reliable anticancer drug and the developed intravesical adhesion system is expected to turn into a potential means of BC [bladder cancer] chemotherapy drug delivery."
The full-text paper is available here.