For the study, ten men cycled for 60 minutes. Researchers collected their blood before and after. Researchers then tested the samples on prostate cancer cell lines and examined how fast the cancer grew. The cancer exposed to the exercise sample grew slower than the cancer exposed to the resting sample.
At the moment, this research isn’t especially applicable to men currently suffering from prostate cancer, which will affect about one in six men. However, it does open the door to a new area of study. In the mean time, exercise anyway—you’ll decrease your risk.