Comprehensive Cancer Care - Exton, PA

470 John Young Way, Suite 400, Exton, PA 19341

Phone. (610) 524-5550Fax. (610) 524-5546

Our Cancer Care Specialists

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    Won S. Chang, MD, is the Medical Director at Comprehensive Cancer Care in Exton, and joined the staff in July 2000. His clinical areas of expertise include breast cancer as well as cancers of the head and neck, lung, gastrointestinal tract, and prostate.

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      Gregory Ochsner, MD, is a board-certified radiation oncologist. He began practicing radiation oncology at the Exton Cancer Center in 1995, the predecessor to Comprehensive Cancer Care which opened in February 2000. His clinical areas of expertise include head & neck, lung cancers, prostate and gynecologic malignancies.

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        In 1988 Dr. Yelovich joined the Radiation Oncology Department at the Exton Cancer Center, and in 1999 began working on the development of Comprehensive Cancer Care in Exton, which opened in early 2000. Dr. Yelovich has served on the Board of Directors at Brandywine Hospital, the regional American Cancer Society chapter, and numerous physician organizations involved in the improvement of health care and cancer care delivery in Chester County.

        Our Cancer Care Technologies

        Dupuytrens Radiation Treatment

        3D Conformal Radiation Therapy

        Three-dimensional conformal radiation therapy (3D-CRT) uses computers, CT scans and MRI scans to create detailed, three-dimensional representations of the tumor and surrounding organs. The treatment team uses these images to shape the radiation beams to match the size and shape of the tumor. The tools used to shape the radiation beams are multileaf collimators or custom fabricated heavy metal blocks inserted between the beam and the patient. Nearby normal tissue receives less radiation exposure because the radiation beams are targeted directly at the tumor.

        Accelerated Partial-breast Irradiation (APBI)

        Accelerated partial breast irradiation (APBI) is high-dose-rate (HDR) internal therapy for breast cancer, administered following a lumpectomy. There are several different applicators including SAVI®, Mammosite®, and Contura®. A radioactive Iridium-192 seed at the end of a metallic wire and contained within a computer-controlled HDR delivery system is directed to 50 or so pre-defined positions within a set of catheters, which are inserted into the lumpectomy site through plastic tubes or a balloon. The HDR delivery system directs the seed sequentially along each catheter tube, stopping at pre-defined dwell positions and delivering radiation along the length of the tube within the lumpectomy site and immediate surrounding area. Treatment is delivered twice a day over five treatment days. After each application, the radioactive seed is withdrawn from the tubes into a lead-lined box and the patient (now non-radioactive) can go home. After the ten treatments are completed, the balloon or catheter array is removed.

        CT Scanning & Simulation

        Computer Tomography (CT) Scanning & Simulation allows the cancer specialists to design a treatment plan specifically for the patient based on the size, location, and shape of the tumor. The patient will have three-dimensional images (CT Scans) taken. These are used with the treatment planning software that helps determine how to best deliver the radiation beams while reducing damage to surrounding areas. In some cases, it may be necessary to mark the patient’s skin with a tiny marker so that the patient is perfectly realigned in the correct position for every session of radiation therapy. The need for a temporary or permanent marker will be discussed with the patient before the simulation.

        Image-Guided Radiation Therapy (IGRT)

        Image-Guided Radiation Therapy (IGRT) combines three-dimensional images, such as CT scans, with the precise technology of either 3-D or intensity-modulated radiation therapy (IMRT) to pinpoint and treat cancerous tumors. The images allow the cancer specialists to precisely localize the tumor each time radiation therapy is administered. This improves both accuracy of delivery and safety by reducing radiation exposure to other areas of the body including nearby tissue and organs. IGRT is used to treat tumors in areas of the body that are prone to movement, such as the lungs, liver, and prostate gland, as well as tumors located close to critical organs and tissues.

        Intensity-Modulated Radiation Therapy (IMRT)

        Intensity-modulated radiation therapy (IMRT) is an advanced form of external radiation treatment that allows precise targeting of tumor cells. The CT simulator localization scan or other three-dimensional images provide the radiation oncologist with an understanding of the shape and location of the tumor. With 3D planning, the radiation oncologist specifies the dose from various beams and sums up those doses to calculate the dose to tumor and normal tissue (forward planning). With IMRT, the radiation oncologist specifies the dose desired to give the tumor and the doses acceptable to the normal tissues (as low as possible). Then the computer system provides millions of alternative beam positions and the varying intensities of each beam, comparing one plan to the next until the best plan is identified. This is called inverse planning. Since each beam is broken up into many sub-beams of varying intensity the process is called intensity-modulated radiation.


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