For most of his life, John Leiba has known what it means to keep moving. At 77, the Spanish Town native still carries the discipline of a man who once ran six miles every morning, five days a week, and completed his best marathon at age 50 in three hours and 19 minutes. But prostate cancer entered his story quietly. Leiba had no pain, no noticeable change in his health and no symptoms to suggest that something was wrong. Instead, regular health checks revealed a prostate-specific antigen (PSA) reading that kept rising.