Physical Activity Does Not Protect Against Noninvasive Breast Cancer (image) FECYT - Spanish Foundation for Science and Technology Share Print E-Mail Caption Noninvasive, or in situ breast cancer, is characterized by the fact that it does not invade or does not multiply in other cells. Unlike invasive breast cancer, it is not benefited by physical exercise. The experts suggest that exercise would only have protective effects once the tumor starts to invade the breast tissue. Credit SINC Usage Restrictions None 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.