Radiation Therapy Services Added To Russell Microcap Index

FORT MYERS, Fla., June 27 /PRNewswire-FirstCall/ -- Radiation Therapy Services, Inc. , a leading operator of radiation therapy centers, announced today that it has been added to the Russell Microcap(TM) Index, effective June 24, 2005. The Russell Microcap(TM) Index is comprised of the smallest 1,000 securities in the small-cap Russell 2000(R) Index plus the next 1,000 companies, based on a ranking of all U.S. equities by market capitalization. This new index offers investors a comprehensive, unbiased barometer to compare their performance against a genuine micro-cap marketplace of stocks.

Dr. Dosoretz, President and Chief Executive Officer, said, “We are pleased that Radiation Therapy has been added to the Russell Microcap Index. We expect our inclusion in this index, as well as our recent inclusion in the Russell 3000 and Russell 2000 Indexes will continue to raise the visibility of our Company within the investment community.”

Russell indexes are widely used by investment managers and institutional investors for index funds and as benchmarks for both passive and active investment strategies. More than $2.5 trillion in assets currently are benchmarked to them. Investment managers who oversee these funds purchase shares of member stocks according to that company’s weighting in the particular index.

Companies in the Russell Microcap(TM) were ranked as of May 31 by total market capitalization and weighted based on free-float adjustment. Free-float adjustment means stocks are weighted by their available market capitalization, which is calculated by multiplying the primary closing price by the available shares.

About Radiation Therapy Services

Radiation Therapy Services, Inc., which operates radiation treatment centers primarily under the name 21st Century Oncology, is a provider of radiation therapy services to cancer patients. The Company’s 65 treatment centers are clustered into 21 regional networks in 13 states, including Alabama, Arizona, Delaware, Florida, Kentucky, Maryland, Massachusetts, Nevada, New Jersey, New York, North Carolina, Rhode Island and West Virginia. The Company is headquartered in Fort Myers, Florida. More information about the Company can be found at its Web site www.rtsx.com.

This release may contain forward-looking statements about the Company’s future plans, expectations and objectives. Words such as “may,” “will,” “expect,” “intend,” “anticipate,” “plan,” “believe,” “seek,” “could” and “estimate” and variations of these words and similar expressions are intended to identify forward-looking statements. These forward-looking statements are not historical facts and are subject to risks and uncertainties that could cause the actual results to differ materially from those projected in these forward-looking statements including, but not limited to those risk factors described in the “Risk Factors” section and other information in the Company’s recently filed quarterly report on Form 10-Q, as well as the Company’s other filings with the Securities and Exchange Commission which are available on the SEC’s website at www.sec.gov. Readers of this release are cautioned not to place undue reliance on forward-looking statements. The Company undertakes no obligation to publicly update or revise the forward-looking statements contained herein to reflect changed events or circumstances after the date of this release.

Contacts: Dave Koeninger Chief Financial Officer Radiation Therapy Services, Inc. 239-931-7282 dkoeninger@rtsx.com Investors/Media: Nick Laudico/Jason Rando The Ruth Group 646-536-7030/7025 nlaudico@theruthgroup.com jrando@theruthgroup.com

Radiation Therapy Services, Inc.

CONTACT: Dave Koeninger, Chief Financial Officer of Radiation TherapyServices, Inc., +1-239-931-7282, or dkoeninger@rtsx.com, orInvestors-Media, Nick Laudico, nlaudico@theruthgroup.com, or Jason Rando,jrando@theruthgroup.com, of The Ruth Group, +1-646-536-7030 or+1-646-536-7025