https://www.nature.com/articles/s41467-018-04814-4
Note: The U.S. approved vaccine may not be helpful for this purpose and of, course, this is only early research:
Association between post-diagnostic use of cholera vaccine and risk of death in prostate cancer patients
Nature Communications volume 9, Article number: 2367 (2018)
...
In summary, this population-based study shows that the use of cholera vaccine is associated with a decreased mortality in patients with prostate cancer. Risk reduction was largely consistent, irrespective of the age of the patients at the time of diagnosis and clinical stage. The findings from this study need to be confirmed by further randomized controlled studies to exclude the possibility of chance findings.
Nature Communications volume 9, Article number: 2367 (2018)
...
In summary, this population-based study shows that the use of cholera vaccine is associated with a decreased mortality in patients with prostate cancer. Risk reduction was largely consistent, irrespective of the age of the patients at the time of diagnosis and clinical stage. The findings from this study need to be confirmed by further randomized controlled studies to exclude the possibility of chance findings.
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