The U.S. vaccine, Vaxchora, is not the same as the Swedish Dukoral. I see
no published research since that one Swedish study,
Association between post-diagnostic use of cholera vaccine and risk of death in prostate cancer patients [2018]
And, as has been noted elsewhere, association is not necessarily causation. It would be nice if Dukoral were available here, as it is in Canada. It also requires a booster at 2 years. On the plus side, the same researchers found an association with a reduced rate colorectal cancer.
Djin