Gene Therapy (IMAGE) Houston Methodist Caption The image on the left shows high-grade aggressive prostate cancer before treatment. the image on the right shows no evidence of cancer after combined gene therapy and radiotherapy. Credit Houston Methodist Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.