I will risk offering some "misguided advice", but I too am skeptical that it is unlikely that Bengals are more predisposed to cancer than other breeds .
That said, I am personally an advocate for iodine supplementation for cancer prevention. Iodine is key in promoting cell apoptosis, which is natural cell death. Cancer is the opposite, where cells don't die off on schedule. Despite the widespread use of iodized salt in human diets, many people are iodine deficient. This is because we are exposed to other elements from the right hand column of the periodic table called halides, which compete with and displace iodine. Bromine is probably most widespread in the environment for humans. In the states, it is present in brominated flour (bleached flour), hot tubs, pools and lots of other things. Fluorine and chlorine are also in the group of elements and are everywhere in our environment.
I don't know how to supplement iodine safely for a cat. Elemental iodine is poison when ingested. What I do for myself is apply iodine tincture topically so I absorb it transdermally. I paint it my belly and often use it to heal minor cuts. Health food stores offer some pricey iodine supplements in forms that are safe to ingest.
I am also mindful of including iodine rich foods in my diet. Eggs, potato, fish. Sea vegetables like kelp are rich in iodine, and I believe kelp tablets and kelp powder is available as a supplement. These are probably better options for a cat.
I am not a veterinarian or a medical professional. You will want to do your own research to see if you think kelp and other foods for iodine supplementation make sense for your bengal.
Or you can try to figure out a way to get rid of the bromine, chlorine and fluorine in the environment.
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