Calypso Medical Technologies is a Seattle-based, privately held medical device company. The Company's proprietary tumor localization system utilizes miniaturized implanted devices (Beacon® electromagnetic transponders) to continuously, accurately and objectively track the location of tumors for improved accuracy and management of radiation therapy delivery. The technology is designed for body-wide cancers commonly treated with radiation therapy. The products are FDA 510(k) cleared for use in the prostate and post-operative prostatic bed. The Company has strategic relationships with Varian Medical Systems, Siemens Medical Systems, Elekta Corporation, and Philips Medical.