Breast biopsy guided by imaging techniques such as ultrasound is widely used to evaluate suspicious masses within the breast. Currently, ultrasound imaging does not allow live guidance during breast biopsy. The current procedure allows the physician to determine the location and extent of a tumor in the patient breast before inserting the needle. However, there are several problems with this procedure: the complex interaction dynamics between the needle force and the breast tissue will likely displace the tumor from its original position necessitating multiple insertions, causing surgeons' fatigue, and compromising the structural integrity of the tissue specimen. In this work, we present a new concept for real-time manipulation of a tumor using a robotic force controller that monitors the image of the tumor to generate appropriate force to position the tumor at a desired location. The idea here is to demonstrate that it is possible to manipulate a tumor in real-time by applying co...