Cancer Therapy 'Tumor Sanctuaries' and the Breeding Ground of Resistance (image) PLOS Share Print E-Mail Caption Tissues where tumor growth is fastest are most affected by drugs, whereas tissues where growth is slow may be tumor sanctuaries. It is these sanctuary sites that are the breeding ground of resistance. Credit Feng Fu Usage Restrictions CC BY 4.0 Share Print E-Mail 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.