A study showed that using magnetic resonance spectroscopy to determine the more aggressive areas in a glioblastoma multiforme tumor followed by high-dose radiation from gamma knife radiosurgery combined with standard radiotherapy increased patients' survival rates by 3.7 months compared with using conventional radiotherapy alone. "The four-month increase is quite significant as the median survival of patients treated with conventional radiotherapy alone is only one year," the lead author said.

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