About 21st Century Oncology

Radiation Therapy Services (RTSI) operates almost 120 radiation treatment centers in several countries, including seven that involve hospital-based treatment centers and other groups. Operating primarily as 21st Century Oncology, the company provides a wide variety of radiation therapy services, including image-guided radiation therapy, tomotherapy for treatment directly into affected areas, seed implantation for prostate cancer, and stereotactic radiosurgery for treating brain tumors. Its centers also participate in clinical research trials for cancer treatment. 

Geographic Reach

The company operates 118 treatments centers, including 91 centers in 16 US states, 26 centers in six countries in Latin America, and one center in India.


The company grows by acquiring or developing centers in new markets and by building new radiation treatment centers in its existing markets based on capacity, demographics, and competitive considerations. Some facilities are developed through partnerships with hospitals or physician groups. Its growth strategy for existing facilities also includes optimizing the use of advanced technologies and increasing the number of doctor referrals.

In 2011 the company acquired Medical Developers (MDLLC) for about $80 million. The MDLLC deal gave the company nearly 30 cancer treatment facilities in six Latin American countries. The purchase not only expanded RTSI's reach geographically, but also helped to diversify its payer base by adding a range of new services in new markets.


RTSI is a wholly-owned subsidiary of Radiation Therapy Services Holdings, Inc., an indirect subsidiary of Vestar Capital Partners and RT Investments.

Company Background

RTSI had agreed to be taken private in order to expand its operations without pressure from shareholders. The company was acquired by private investment firm Vestar Capital in 2008 in a deal valued at more than $1 billion.



Based on 69 reviews
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Radiation therapist for cancer patients and training new employees and students
Radiation Therapist, Ocala, FL - May 28, 2015
The patients were the most enjoyable part of job. We never knew when we were getting off, because we always had to stay for ANY new patient, for sims or sim and treat.


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2270 Colonial Blvd.
Fort Myers FL, United States 33907
$500M to $1B (USD)
1,001 to 5,000
21st Century Oncology website