Associates in Radiation Medicine (ARM) was formed by two radiation oncologists in 1994 at their first radiation center located in Silver Spring Maryland.   This facility was purchased by Holy Cross Hospital in 1995 and a very successful two-decade partnership between ARM and Holy Cross Hospital was created. A second location was added in 1997 in Rockville, Maryland.

The next phase of expansion for ARM occurred in 1999 when Holy Cross Hospital and Adventist HealthCare joined together in a partnership to purchase additional radiation oncology centers in Waldorf and College Park, Maryland. In 2004, the College Park office was moved to Bowie Maryland.  This new entity was called Maryland Regional Cancer Care (MRCC).    As the community need for radiation services grew, an additional radiation center was purchased by MRCC in Charlotte Hall, Maryland in 2006.

In 2006, a new joint venture between Calvert Memorial Hospital, Civista Healthcare, St. Mary’s Hospital, Adventist HealthCare, and Holy Cross Hospital was formed.  The joint ownership of the Charlotte Hall and Waldorf Radiation Oncology Centers was named Chesapeake Potomac Regional Cancer Center (CPRCC).    As our hospital partners added their radiation oncology footprint, ARM radiation oncologists were selected to provide physician services at these centers.

In 2007, Peninsula Regional Medical Center in Salisbury Maryland requested that ARM physicians staff and manage their radiation oncology clinic within the hospital.  Patient volume had increased under the care of ARM physicians, requiring an increase from an initial single radiation oncologist to a current staff of three physicians as well as physics and dosimetry support provided by ARM.

 Doctors Community Hospital in Lanham Maryland created a new radiation center within the hospital complex in 2009. This new center was combined with the radiation center in Bowie Maryland to form Doctors Regional Cancer Center (DRCC).

In 2011, a radiation oncology office was opened in Germantown Maryland by Adventist Health Care and ARM physicians were selected to staff this new location.

In 2013, the Aquilino Cancer Center was opened on the campus of the Shady Grove Adventist Hospital and the Rockville office of MRCC was closed.  ARM staff moved to their new location within the Aquilino Cancer Center.

In 2017 PRMC opened a new state of the art integrated cancer center in Ocean Pines. With these additional centers, ARM physicians now staff a total of 9 radiation oncology clinics across the state of Maryland, making ARM the largest private practice group in the state, serving both the Western and Eastern Shore of Maryland.  The practice has grown to 15 radiation oncologists, as well as physicists and dosimetry staff.