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Low-grade brain tumors: Radiation plus chemotherapy is best treatment, trial suggests

April 14, 2016

COLUMBUS, Ohio - New clinical-trial findings show that patients with a low-grade form of brain cancer who are treated with radiation plus a combination of chemotherapy drugs have better survival than patients treated with radiation alone.

The study, published in the New England Journal of Medicine, comes from a randomized phase III clinical trial ( number NCT00003375) of 251 people with grade 2 gliomas, tumors that occur mostly in young adults and cause progressive neurological problems and premature death. Researchers at The Ohio State University Comprehensive Cancer Center - Arthur G. James Cancer Hospital and Richard J. Solove Research Institute (OSUCCC - James) helped lead the study.

Patients treated with radiation therapy plus chemotherapy had an overall survival of 13.3 years compared with 7.8 years for patients treated with radiation alone. The radiation-plus-chemotherapy group also showed better disease-free survival (10.4 years versus 6.1 years for those treated with radiation alone).

In addition, patients with tumor cells having a mutation in a gene called IDH1 had significantly better overall survival than those without the mutation, regardless of treatment (13.1 years versus 5.1 years).

"This is a practice-changing study," says Arnab Chakravarti, MD, chair and professor of Radiation Oncology and director of the Brain Tumor Program at the OSUCCC - James. Chakravarti is the trial's translational research national study chair.

"These findings show that this combined radiation and chemotherapy regimen improves clinical outcome compared to radiation alone.

Chakravarti's lab was instrumental in validating IDH1 as a prognostic biomarker during the trial. "Furthermore, trends in the data suggest that IDH1 could be a useful predictive biomarker to identify glioma patients who would benefit from chemotherapy plus radiation therapy versus radiation therapy alone. These are immensely impactful findings of this phase III study," he says.

(Predictive biomarkers help predict a patient's response to a particular therapy; prognostic biomarkers help predict survival regardless of the therapy used.)

"Many low-grade gliomas progress to much more lethal grade III and IV tumors over time, so identifying the most effective treatment strategy is critical to ensure that patients have the best outcomes," says Chakravarti, who is also the Max Morehouse Chair in Cancer Research at Ohio State.

Low-grade gliomas represent less than 1 percent of all human tumors in the United States. The average survival times vary depending on the tumor's structural, molecular and genetic features.

The trial, which was sponsored by the Radiation Therapy Oncology Group, enrolled patients from 1998 to 2002. Median follow-up time for surviving patients was 11.9 years. About half the patients were treated with radiation therapy plus three chemotherapy drugs: procarbazine, lomustine (also called CCNU) and vincristine.

The study's key findings:

Other researchers involved in this study were Erica H. Bell, PhD, The Ohio State University; Jan C. Buckner, MD, Mayo Clinic, Rochester, MN; Edward G. Shaw, MD, Wake Forest University; Dennis Bullard, MD, Triangle Neurosurgeons, Raleigh; Stephanie L. Pugh, PhD, and Minhee Won, MA, NRG Oncology Statistics and Data Management Center; John H. Suh, MD, Cleveland Clinic; Mark R. Gilbert, MD, and Paul D. Brown, MD, of MD Anderson Cancer Center; Geoffrey R. Barger, MD, and Harold Kim, MD, Wayne State University; Stephen Coons, MD, Barrow Neurological Institute; David Brachman, MD, Arizona Oncology Services Foundation; Peter Ricci, MD, Radiology Imaging Associates, Englewood, CO; Keith Stelzer, MD, Mid-Columbia Medical Center, The Dalles, OR; Christopher J. Schultz, MD, Medical College of Wisconsin; Jean?Paul Bahary, MD, Centre Hospitalier de l'Université de Montréal, Montreal; Barbara J. Fisher, MD, London Regional Cancer Program, London, ON; Albert D. Murtha, MD, the Cross Cancer Institute, Edmonton, AB; Minesh P. Mehta, MD, University of Maryland; and Walter J. Curran Jr., MD, Emory University.

The Ohio State University Comprehensive Cancer Center - Arthur G. James Cancer Hospital and Richard J. Solove Research Institute strives to create a cancer-free world by integrating scientific research with excellence in education and patient-centered care, a strategy that leads to better methods of prevention, detection and treatment. Ohio State is one of only 45 National Cancer Institute (NCI)-designated Comprehensive Cancer Centers and one of only four centers funded by the NCI to conduct both phase I and phase II clinical trials. The NCI recently rated Ohio State's cancer program as "exceptional," the highest rating given by NCI survey teams. As the cancer program's 306-bed adult patient-care component, The James is a "Top Hospital" as named by the Leapfrog Group and one of the top cancer hospitals in the nation as ranked by U.S.News & World Report.

Ohio State University Wexner Medical Center

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