In a new study done by the Cleveland Clinic researchers have identified how certain tumors become resistant to prostate cancer drugs.

Prostate cancer needs androgen to grow so it is typically treated with drugs which stop the production of the compound and starves the tumor.

But certain tumors resist those drugs and develop the ability to make androgen on their own. And now researchers have found the cause, "We've really identified a critical mechanism of resistance to standard treatment of prostate cancer and that this is a critical, but first step in terms of developing better treatments." says Dr. Nima Sharifi/Cleveland Clinic.

Doctors hope the discovery allows for the development of a drug that can stop the tumor from creating its own androgen.

The findings could also be used to stop other types of cancer as well. Other than skin cancer, prostate cancer is the most common cancer in American men.