Abstract: A dome for applying a vacuum to a patient's breast is comprised of a generally rigid dome capable of withstanding a pressure differential, with a rim and rim cushion underlying the rim of the dome for supporting a rim from the patient's skin surface. The rim may be generally wider than the dome in order to distribute the attendant forces across a greater surface and avoid tissue damage. A sticky sole underlies the rim cushion and seals the rim cushion to the patient's skin to thereby preserve the vacuum within the dome. The sticky sole may be comprised of any adhesive material or even be achieved through the use of an appropriate material for the rim cushion itself. A portable pump unit is connected to the domes and maintains the vacuum within the domes during a recommended protocol. By using the device in accordance with the prescribed protocol, the growth of cancer cells and tumors within the breasts are inhibited.