The study looked at more than 600 men from around Chicago with higher PSA levels, a prostate-specific antigen used to detect prostate cancer.
All of the participants were also scanned for vitamin D deficiency.
The results have revealed African-American men to have a 2.43 times higher risk of prostate cancer.
When it came to the odds of having aggressive form of this cancer, European Americans had a 3.66 times higher risk, while African Americans had a 4.89 times increased risk.