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
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.