Jennifer Matthews: Robert Miller is a force in front of his congregation. Preaching is his life's work.

His life's battle started 11 years ago when he was diagnosed with prostate cancer.

Robert Miller: All I heard was the word cancer and I'm thinking cancer, death, cancer, death.

Jennifer Matthews: PSA levels, the markers for prostate cancer, are considered high at 4. At diagnosis, Robert's levels were nearly 80. His prostate was removed, but the cancer stayed behind. He soon found Doctor Michael Carducci.

When prostate cancer spreads, it first goes to the bones. Doctor Carducci is studying the drug Atrasentan to keep the cancer from getting there.

Dr. Michael Carducci: This may not necessarily kill cancer cells per se, it may slow prostate cancer down to a trickle.

Jennifer Matthews: It does that by targeting endothelin - a protein overproduced in men with prostate cancer that has spread.

Dr. Michael Carducci: We get to the lock before endothelin does and therefore, the cancer cells never see this growth factor, this protein that really stimulates further growth.

Jennifer Matthews: Studies show there was a 52% delay in the time it took for the cancer to progress. Robert still has cancer, but it hasn't reached his bones.

Robert Miller: Eleven years ago, I never thought I would see 59. I am satisfied that God allowed me to live this long.

Jennifer Matthews: This is Jennifer Matthews reporting.