AMSTERDAM, Nov. 30 /PRNewswire-FirstCall/ -- Researchers from VU University Medical Center in Amsterdam have reported that RapidArc® radiotherapy from Varian Medical Systems (NYSE: VAR) has clinical advantages over earlier fixed-beam approaches to stereotactic treatments of lung tumors. Their findings, based on treatment of 85 medically inoperable lung cancer patients, were reported at the recent annual meeting of the American Society for Radiation Oncology (ASTRO) in Chicago and a condensed version has been published in the 'Green Journal' (Radiotherapy and Oncology) 93 (2009).
"RapidArc enabled much faster treatment for these patients, with treatment in just six minutes, reducing the risk of patient motion and achieving superior dose conformity around the target while reducing dose to the chest wall by almost a third," says Dr. Wilko Verbakel, medical physicist. "Dose conformity is extremely important when you are treating close to critical structures and the conformity you see with RapidArc is always better or at least as good as with fixed-beam IMRT and certainly better than achievable with ten static non-coplanar beams or dynamic conformal arc."
Clinicians at VU deliver stereotactic RapidArc treatments using the Novalis Tx™ radiosurgical platform from Varian and BrainLAB. The high dose delivery capability of Novalis Tx combined with the speed of RapidArc enables stereotactic treatments with beam-on time of as little as six and a half minutes, even for the highest doses, which previously took about 30 minutes to deliver.
Hypo-fractionated stereotactic lung treatments at VU are delivered in three sessions of 18 Gy each, five sessions of 11 Gy each or eight sessions of 7.5 Gy each, depending on the size and position of the tumor. Planning, described by Dr. Verbakel as 'very easy' using RapidArc, is based on 4D CT scans and the treatment field allows a small margin to account for tumor motion caused by breathing. Additional recent research by the team at VU has shown that, unlike with some other advanced radiation delivery techniques, treatment of a moving tumor with RapidArc has no negative dosimetric consequences.
RapidArc®, Varian's technology for delivering volumetric modulated arc therapy (VMAT), enables clinicians to deliver a highly-precise image-guided intensity-modulated treatment quickly, often with as little as one or two revolutions of the treatment machine around the patient. This enables treatments that are up to eight times faster than alternative approaches.
Professor Suresh Senan, radiation oncologist at VU, adds, "We are very encouraged by these findings and RapidArc is now our standard technique for all patients with stage 1 lung tumors."
(*)This research received grant support from Varian Medical Systems.
Editorial Contact: Neil Madle, Varian Medical Systems, +44 7786 526068, firstname.lastname@example.org
W.F.A.R. Verbakel, S. Senan, C. Ong, J.P. Cuijpers, B.J. Slotman, F.J. Lagerwaard Rapid Delivery of Stereotactic Radiotherapy for Peripheral Lung Tumors using Volumetric Intensity Modulated Arcs - Radiother Oncol. 2009 Oct;93(1): 122-4. Available here: http://www.thegreenjournal.com/article/PIIS0167814009002709/abstract The abstract from ASTRO is available here: http://www.redjournal.org/article/S0360-3016(09)01321-2/fulltext
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Varian Medical Systems, Inc., of Palo Alto, California, is the world's leading manufacturer of medical devices and software for treating cancer and other medical conditions with radiotherapy, radiosurgery, proton therapy, and brachytherapy. The company supplies informatics software for managing comprehensive cancer clinics, radiotherapy centers and medical oncology practices. Varian is a premier supplier of tubes and digital detectors for X-ray imaging in medical, scientific, and industrial applications and also supplies X-ray imaging products for cargo screening and industrial inspection. Varian Medical Systems employs approximately 5,100 people who are located at manufacturing sites in North America, China, and Europe and in its 79 sales and support offices around the world. For more information, visit http://www.varian.com/
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