IsoRay, Inc.'s Cesium-131 Lung Cancer Treatment Reports 96% Success In Local Control And 100% Survival At 5 Years In High Risk Patients In Newly Published Report

RICHLAND, WA--(Marketwired - May 20, 2015) - IsoRay, Inc. (NYSE MKT: ISR), a medical technology company and innovator in seed brachytherapy and medical radioisotope applications, today announced the on-line publication of the first major peer reviewed study showing improved results using IsoRay's Cesium-131 seeds in the treatment of lung cancer.

IsoRay CEO Dwight Babcock commented, "We are extremely excited to have our Cesium-131 isotope seeds and mesh used in the treatment of non-small cell lung cancers with such outstanding patient outcomes. Notable physicians, including the authors of this study, are seeking better solutions and outcomes for their patients. We are continuing to develop our product offerings internally with support from these industry leaders. With every success that has been reported, the medical community is rapidly becoming aware of the innovative alternative our Cesium-131 products offer to cancer patients."

Dr. Bhupesh Parashar MD, of Weill Cornel Medical College, is lead author of the publication titled: 'Analysis of Stereotactic Radiation vs. Wedge Resection vs Wedge Resection Plus Cesium-131 Brachytherapy in Early-stage Lung Cancer'. The study noted that the survival rate at 5 years was exceptional for the Cesium-131 group, which included many high risk patients, and Cesium-131 added no noticeable side effects. Treatment with Cesium-131 was performed at the time of the surgery as a single treatment, in contrast to another treatment option, external radiation, which requires numerous hospital visits. To review the report as published online as of May 19, 2015, please follow the link provided here: http://www.sciencedirect.com/science/article/pii/S1538472115004559

Babcock said, "Published studies are the final step to commercialization as leaders in the medical arena recognize the important need for a new powerful weapon in the battle against cancer. This latest publication, in conjunction with other recent published reports on metastatic brain cancer and gynecological cancers, are proving Cesium-131's time is now. Not only does Cesium-131 work but it is a single application providing improved quality of life for the patient."

IsoRay's various products, including Cesium-131 seeds, sutured seeds, stranded mesh and the GliaSite® radiation therapy system, give physicians the ability to directly place a specified dosage of radiation in areas where cancer is most likely to remain after completion of a tumor removal or by placing seeds within the prostate. The ability to precisely place a specified dose of radiation means there is less likelihood for damage to occur to healthy surrounding tissue compared to other alternative treatments. IsoRay's cancer fighting products diminish the ability of the tumor to recur, resulting in important benefits for patients in longevity as well as quality of life.

IsoRay is the exclusive manufacturer of Cesium-131. The pioneering brachytherapy therapy is one of the most significant advances in internal radiation therapy in 20 years. Cesium-131 allows for the precise treatment of many different cancers because of its unrivaled blend of high energy and its 9.7 day half-life (its unequaled speed in giving off therapeutic radiation).

In addition to its CMS codes, Cesium-131 is FDA-cleared and holds a CE mark for international sales in seed form for the treatment of brain cancer, prostate cancer, lung cancer, ocular melanoma cancer, colorectal cancer, gynecologic cancer, head and neck cancer and other cancers throughout the body. The treatment can be deployed using several delivery methods including single seed applicators, implantable strands and seed sutured mesh. IsoRay also sells several new implantable devices, including the GliaSite® radiation therapy system.

About IsoRay
IsoRay, Inc., through its subsidiary, IsoRay Medical, Inc. is the sole producer of Cesium-131 brachytherapy seeds, which are expanding brachytherapy options throughout the body. Learn more about this innovative Richland, Washington company and explore the many benefits and uses of GliaSite® and Cesium-131 by visiting www.isoray.com. Join us on Facebook/Isoray. Follow us on Twitter @Isoray.

Safe Harbor Statement
Statements in this news release about IsoRay's future expectations, including: the advantages of our products and their delivery systems, whether IsoRay will be able to continue to expand its base beyond prostate cancer, whether sales of our products will continue at historic levels or increase, whether the use of our products will increase or continue, whether we will continue to receive support from industry leaders, whether awareness of our products in the medical community will continue or increase, timing of commercialization of our products, and all other statements in this release, other than historical facts, are "forward-looking statements" within the meaning of the Private Securities Litigation Reform Act of 1995 ("PSLRA"). This statement is included for the express purpose of availing IsoRay, Inc. of the protections of the safe harbor provisions of the PSLRA. It is important to note that actual results and ultimate corporate actions could differ materially from those in such forward-looking statements based on such factors as physician acceptance, training and use of our products, our ability to successfully manufacture, market and sell our products, our ability to manufacture our products in sufficient quantities to meet demand within required delivery time periods while meeting our quality control standards, our ability to enforce our intellectual property rights, whether additional studies are released and support the conclusions of past studies, patient results achieved with our products, successful completion of future research and development activities, our ability and the ability of our distributors and customers to receive and maintain all required regulatory approvals in the U.S. and internationally, continued compliance with ISO standards as audited by BSI, the success of our sales and marketing efforts, changes in reimbursement rates, changes in laws and regulations applicable to our products, and other risks detailed from time to time in IsoRay's reports filed with the SEC. The Company undertakes no obligation to publicly update or revise any forward-looking statements, whether as a result of new information, future events or otherwise.