Cancer Implants Now Performed at Cowles Clinic. In an effort to provide the best treatments with greater patient access, urologist, Dr. Bob Cowles is now performing Permanent Prostate Seed Implants and High Dose Rate (HDR) prostate implants on site at Georgia Center for Total Cancer Care at Cowles Clinic.These therapies are two of the most effective radiation treatments used in the U. S. for ...Physicians‧About Us‧Services‧Urology‧Athens Orthopedic Clinic‧Home.